Month: September 2020

A common heterocyclic compound, 154127-42-1,(S)-4-Hydroxy-2-(3-methoxypropyl)-3,4-dihydro-2H-thieno[3,2-e][1,2]thiazine-6-sulfonamide 1,1-dioxide, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 154127-42-1

Compound (VII) (112g, 0.313 mol) was suspended in tetrahydrofuran (10 vol). Methanesulfonic anhydride (65.7g, 0.374 moles) was added in one lot and stirred. The reaction mixture was cooled to 0-50C and pyridine (2.5 vol) was added slowly over a period of 45 minutes. The reaction was monitored by TLC [Mobile phase dichloromethane: methanol, 9.5:0.5] for completion. As reaction product the intermediate compound (Vila) was obtained.To the above reaction mixture 70% aqueous ethylamine solution (400 ml, 10 vol) was added slowly at 0-5C. After the complete addition, the reaction mixture was stirred at 25-300C for 12.0 h. The reaction is monitored by TLC [Mobile phase dichloromethane: methanol, 9.5:0.5] for completion. The organic layer (ethylamine and tetrahydrofuran mixture) was distilled off completely below 500C under reduced pressure. The aqueous phase was acidified with concentrated hydrochloric acid and the pH adjusted to 3.0 at 15-25C. The aqueous phase was extracted with t-butyl methyl ether twice (2 x 2.0 vol) to remove any organic impurities if present. The t-butyl methyl ether layer was extracted with 1 N HCI solution and the layers separated.The aqueous layers were combined, treated with activated charcoal and heated at 65-700C. The contents were stirred at 65-700C for 30 minutes, filtered through hyflo supercel at 65-700C and washed with preheated water(65-700C). The filtrate was cooled to 25-30C and the pH was adjusted to 8 with solid sodium bicarbonate. The reaction mixture was stirred for 12 h for crystallization. If the crystallization did not occur, the reaction mass was filtered through a Bchner funnel, extracted with ethyl acetate (3 x 5.0 vol), dried over sodium sulphate and filtered. The organic layer was distilled completely (below 500C) under reduced pressure. The crude product was obtained as a pale yellow syrup, which was washed with hexane (4 x 1.0 vol) to yield a residue which crystallized to a solid on standing.Yield of crude compound (VIIl): 8Og (66.3%)

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,154127-42-1,(S)-4-Hydroxy-2-(3-methoxypropyl)-3,4-dihydro-2H-thieno[3,2-e][1,2]thiazine-6-sulfonamide 1,1-dioxide,its application will become more common.

Reference£º
Patent; AZAD PHARMACEUTICAL INGREDIENTS AG; RAMAKRISHNAN, Arul; SONI, Anil Kumar; ADHIKARI, Sujit Das; RAO, Kommula Srinivasa; PAUL, Soumendu; SRINIVASULU, Ganta; WO2010/103115; (2010); A1;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 3939-23-9,3-Bromo-10H-phenothiazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 3939-23-9

In a nitrogen-flushed 250 mL round-bottom flask with a magnetic stir bar and septum 3-bromo-10H-phenothiazine (4.95 g, 17.8 mmol) was dissolved in dry THF (50 mL) under nitrogen. The colorless solution was deaerated by a constant stream of nitrogen through a syringe for 10 min and cooled to 0 C (ice bath/water). Potassium tert-butanolate (2.40 g, 21.4 mmol) was added to the reaction mixture under nitrogen and the reaction mixture was allowed to come to room temperature and then stirred for 1 h. To this solution 1-bromo hexane (3.00 mL, 21.4 mmol) was slowly added by syringe and stirring at room temp was continued for 16 h. The solvents were removed in vacuo and the residue was adsorbed onto celiteand purified by chromatography on silica gel (n-hexane) to give 5.83 g (90%) of 3-bromo-10-hexyl-10H-phenothiazine (1a) as a yellow resin, Rf (n-hexane) = 0.43. The NMR spectra were in excellent agreement with the literature. 1H NMR (300 MHz, acetone-d6): delta = 0.84 (t, 3J = 7.1 Hz, 3 H), 1.23-1.33 (m, 4 H), 1.44 (dt, 3J = 7.2 Hz, 3J = 6.8 Hz, 2 H), 1.77 (dt, 3J = 7.5 Hz, 3J = 7.5 Hz, 2 H), 3.92 (t, 3J = 7.0 Hz, 2 H), 6.95 (d, 3J = 8.7 Hz, 2 H), 7.03 (dd, 3J = 8.2 Hz, 4J = 0.9 Hz, 1 H), 7.14 (dd, 3J = 7.6 Hz, 4J = 1.4 Hz, 1 H), 7.21 (ddd, 3J = 8.2 Hz, 3J = 7.3 Hz, 4J = 1.6 Hz, 1 H), 7.27 (d, 4J = 2.2 Hz, 1 H), 7.32 (dd, 3J = 8.6 Hz, 4J = 2.3 Hz, 1 H). -13C NMR (75 MHz, acetone-d6): delta = 14.2 (CH3), 23.2 (CH2), 27.0 (CH2), 27.4 (CH2), 32.1 (CH2), 47.9 (CH2), 114.7 (Cquat), 116.9 (CH), 118.1 (CH), 123.6 (CH), 124.7 (Cquat), 128.1 (Cquat), 128.1 (CH), 128.6 (CH), 130.0 (CH), 130.9 (CH), 145.7 (Cquat), 145.9 (Cquat).

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,3-Bromo-10H-phenothiazine,3939-23-9,its application will become more common.

Reference£º
Article; Urselmann, Dominik; Deilhof, Konstantin; Mayer, Bernhard; Mueller, Thomas J. J.; Beilstein Journal of Organic Chemistry; vol. 12; (2016); p. 2055 – 2064;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 92-30-8,2-(Trifluoromethyl)-10H-phenothiazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 92-30-8

92-30-8, 2-Trifluoromethylphenothiazine (2.00 g, 7.4831 mmol) was placed in a 500 mL flask, THF (100 mL) dried overanhydrous K2CO3 was added, and then 60% NaH was added sequentially under N2 protection. Mineral oil(1.1973 g, 29.9323 mmol) and 1-bromo-3-chloropropane (2.9601 mL, 29.9323 mmol) were refluxed overnightat a bath temperature of 65 C. After cooling to room temperature, the reaction mixture was poured into EtOAc EtOAc (EtOAc)EtOAc. Ethylacetate (50 mL) was added to dissolve, and silica gel powder (20 g) was added to the solution to dryness, and theresidue was applied to a silica gel column, eluted with ethyl acetate and petroleum ether, and the product wascollected, dried, and dried in vacuo. Product 2-10 (4.9444 g, yield 69.8%).

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,2-(Trifluoromethyl)-10H-phenothiazine,92-30-8,its application will become more common.

Reference£º
Patent; Dalian University of Technology; Li Gaoquan; Xie Aiyun; Zhang Cuifang; Chen Maofen; (23 pag.)CN104829554; (2018); B;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

3080-99-7 A common heterocyclic compound, 3080-99-7,3,4-Dihydro-2H-benzo[b][1,4]thiazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.

(3d) Potassium carbonate (5.2 g, 37.7 mmol) and methyl 4-(bromomethyl)benzoate (2.8 g, 12.6 mmol) were added to a solution of (3c) (1.9 g, 12.6 mmol) in 20 mL of anhydrous DMF. The reaction mixture was heated to 80 C. overnight. After cooling to rt, the solid was filtered off and rinsed with DMF. The filtrate was concentrated in vacuo and the residue was purified on silica gel column to provide methyl 4-(2,3-dihydro-4H-1,4-benzothiazin-4-ylmethyl)benzoate (3.02 g, 80%).

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,3080-99-7,3,4-Dihydro-2H-benzo[b][1,4]thiazine,its application will become more common.

Reference£º
Patent; Duan, Jingwu; Jiang, Bin; Chen, Lihua; Lu, Zhonghui; Barbosa, Joseph; Pitts, William J.; US2003/229084; (2003); A1;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 92-30-8,2-(Trifluoromethyl)-10H-phenothiazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 92-30-8

Step a 4-(3′-indolyl)-1-[1″-(2′”-trifluoromethyl-10′”-phenothiazinyl)-2″-methyl-3″-propionyl]-piperidine hydrochloride 27 g of 2-trifluoromethyl-phenothiazine and 12 g of alpha-methylacryloyl chloride in 100 ml of toluene were 1 for 2 hours and the mixture was evaporated to dryness. The residue was chromatographed over silica gel and elution with a 1– 1 benzene-cyclohexane mixture gave 18 g of 2-trifluoromethyl-10-(alpha-methyl acryloyl)-phenothiazine in the form of white crystals melting at 103¡ãC.

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,2-(Trifluoromethyl)-10H-phenothiazine,92-30-8,its application will become more common.

Reference£º
Patent; Roussel-UCLAF; US3988453; (1976); A;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 154127-42-1,(S)-4-Hydroxy-2-(3-methoxypropyl)-3,4-dihydro-2H-thieno[3,2-e][1,2]thiazine-6-sulfonamide 1,1-dioxide, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 154127-42-1

Prepare a 1L three-vial bottle equipped with a mechanical stirrer, a constant pressure low liquid funnel, and an ice water bath.Add compound of formula A (100 g, 0.28 mol) and acetonitrile (400 mL),Under N2 protection, stirring and cooling to 5 ~ 10 C,Then drop itTrimethyl orthoacetate(77.3g, 0.64mol),The rate of addition is such that the stability of the system does not exceed 15C.After the addition, remove the cooling and continue the reaction for 1 hour.TLC detected the disappearance of the starting material, creating a slightly more polar new point.Concentrate at normal pressure, recover the solvent and add the residue to DCM.Swirling to replace desolvation, and finally high vacuum drying for 1 hour,The residue is a compound of formula B-1Can be directly used in subsequent reactions without purificationThe reaction gave the crude product B-1 in equivalent yield., 154127-42-1

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,154127-42-1,(S)-4-Hydroxy-2-(3-methoxypropyl)-3,4-dihydro-2H-thieno[3,2-e][1,2]thiazine-6-sulfonamide 1,1-dioxide,its application will become more common.

Reference£º
Patent; Shanghai Bo Shirui Life Technology Co., Ltd.; Wang Dong; Wang Fangdao; Wang Meng; Cai Maojun; (16 pag.)CN107722043; (2018); A;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 37441-50-2,1,2-Thiazinane 1,1-dioxide, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 37441-50-2

solution of 2-(3-chloro-4-fluorobenzyl)-8-ethyl-4-fluoro-10-methoxy-6-methyl-7,8- dihydropyrazino[l’,2′: 1,5]pyrrolo[2,3-d]pyridazine-1,9(2H,6H)-dione (0.10 g, 0.23 mmol; Example 139), 1,2-thiazinane 1,1-dioxide (45 mg, 0.33 mmol), and cesium carbonate (0.15 g, 0.46 mmol) in anhydrous DMSO (9.5 mL) was heated in an oil bath at 50 C for 5 hours. The product mixture was filtered through a pad of Celite and the filtrate was subjected to purification on reverse phase preparative HPLC purification. Collection and lyophilization of appropriate fractions afforded the title material. Analytical HPLC indicated that the product is a 1:1 mixture of two isomers that arose from the relative stereochemistry of the 6-methyl group and restricted rotation between the sultam ring and the tricyclic core. ?H NMR (400 MHz, CDCI3) No. 7.48 (m 1H), 7.28 (m, 1H), 7.11 (t, J = 8.5 Hz, 1H), 5.17 (d, J = 14.2 Hz, ?H), 5.34 (in, 1/2 H), 5.29 (d, J = 14.2 Hz, (at)H), 5.23 (d, J = 14.2 Hz, ?H), 5.09 (d, J = 14.2 Hz, ?H), 5.07 (m, ?H), 4.18 (s, 1.5H), 4.16 (s, 1.5H), 4.12-3.17 (m), 2.58-2.00 (m), 1.57 (d, J = 6.6 Hz, 1.5H), 1.42 (d, J = 6.8 Hz, 1.5H), 1.23 (t, J = 6.8 Hz, 1.5H), 1.22 (t, J = 7.1 Hz, 1.5H). ES MS M+1 = 552, 37441-50-2

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,37441-50-2,1,2-Thiazinane 1,1-dioxide,its application will become more common.

Reference£º
Patent; MERCK & CO., INC.; WO2005/110414; (2005); A2;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

272437-84-0 A common heterocyclic compound, 272437-84-0,3-Oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylic acid, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.

Preparation of 3-oxo-3,4-dihydro-2H-benzo[l,41thiazine-6-carboxylic acid [tra/? -4-(8- methoxy-l,2-dihydro-3-oxa-5,9-diaza-cyclopenta[alnaphthalen-2-ylmethyl)-cyclohexyll- amide:3-Oxo-3,4-dihydro-2H-benzo[l,4]thiazine-6-carboxylic acid (31 mg, 0.14 mmol, 1.0 eq) is added at room temperature to a stirred solution of tra?s-4-(8-methoxy-l,2-dihydro-3-oxa-5,9- diaza-cyclopenta[a]naphthalen-2-ylmethyl)-cyclohexylamine (47 mg, 0.14 mmol, 1.0 eq) in N,N-dimethylformamide (4 mL), followed by 1-hydroxybenzotriazole (24 mg, 0.16 mmol, 1.1 eq), N-(3-dimethylaminopropyl)-N’-ethylcarbodiimide hydrochloride (32 mg, 0.16 mmol, 1.15 eq) and NN-diisopropylethylamine (56 mu, 0.32 mmol, 2.25 eq). After 15 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3 x 10 mL) and water (10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a crude product that is purified by preparative HPLC to afford 3-oxo-3,4- dihydro-2H-benzo[l,4]thiazine-6-carboxylic acid [tra?s-4-(8-methoxy-l,2-dihydro-3-oxa- – -5,9-diaza-cyclopenta[a]naphthalen-2-ylmethyl)-cyclohexyl]-amide as a white lyophilized powder (16 mg, 21% yield).1H-NMR (400 MHz, DMSO- 6) delta ppm: 10.67 (s, 1H), 8.49 (s, 1H), 8.23 (d, J = 7.9 Hz, 1H), 8.19 (d, J = 9.0 Hz, 1H), 7.44 (m, 3H), 7.06 (d, J = 9.1 Hz, 1H), 5.21 (m, 1H), 4.01 (s, 3H), 3.74 (m, 2H), 3.51 (s, 2H), 3.14 (dd, J = 7.9, 16.8 Hz, 1H), 1.80-2.00 (m, 5H), 1.66 (m, 1H), 1.57 (m, 1H), 1.39 (m, 2H), 1.13 (m, 2H).MS m/z (+ESI): 505.5 [M+H]+.

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,3-Oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylic acid,272437-84-0,its application will become more common.

Reference£º
Patent; BASILEA PHARMACEUTICA AG; GAUCHER, Berangere; DANEL, Franck Hubert; XIE, Tong; XU, Lin; WO2012/171860; (2012); A1;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

98827-44-2 A common heterocyclic compound, 98827-44-2,Methyl 4-hydroxy-2H-thieno[2,3-e][1,2]thiazine-3-carboxylate 1,1-dioxide, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.

260 kg of 4-hydroxy-2H-thieno [2,3-e] -1,2-thiazine-3-carboxylic acid methyl ester 1,1-dioxide were dissolved in500kgDMF, add potassium carbonate 150kg, warmed to 140 C, and dropping 120kg of dimethyl carbonate, 2h drop end, after the dropwise addition, the reaction was continued for 5h, then add 140kg of potassium carbonate, dropping 300 kg of 2 – aminopyridine in dimethylformamide (DMF) (120kg 2-aminopyridine dissolved in 180 kg DMF), 2h addition was complete, the reaction was continued for 5h. After the reaction, cooling and filtering to remove potassium carbonate, the filtrate was recovered under reduced pressure most of the DMF, the residue was added mass concentration of 3% sodium hydroxide alkaline water, activated carbon bleaching, filtration, the filtrate was purified hydrochloric acid to pH = 3 -4, precipitated yellowish solid, centrifuged, the material was washed until neutral, dried, to give a yellow solid 276kg, yield 83%, product purity 99.85%.

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,98827-44-2,Methyl 4-hydroxy-2H-thieno[2,3-e][1,2]thiazine-3-carboxylate 1,1-dioxide,its application will become more common.

Reference£º
Patent; Jiangsu Engineering Polytechnic College; Yan Bin; Feng Chengliang; Guo Liqiang; (5 pag.)CN106916169; (2017); A;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem

A common heterocyclic compound, 92-30-8,2-(Trifluoromethyl)-10H-phenothiazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route. 92-30-8

General procedure: Phenothiazine 1 (5g, 25.09mmol) was taken in anhydrous N, N-dimethyl formamide (DMF) (50mL) in a dry round bottom flask. Sodium hydride (2g, 50.18mmol) was added under nitrogen condition at 0C and stirred for 30min at room temperature. Methyl iodide (3.4mL, 50.18mmol) was added and continued the stirring for 8h. After that, the reaction mixture (monitored by TLC) was quenched with ice cold water (150mL). The separated solid was filtered off, dried and used as such for the next step.

This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,92-30-8,2-(Trifluoromethyl)-10H-phenothiazine,its application will become more common.

Reference£º
Article; Reddyrajula, Rajkumar; Dalimba, Udayakumar; Madan Kumar; European Journal of Medicinal Chemistry; vol. 168; (2019); p. 263 – 282;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem