Heterocyclic Building Blocks-Thiazole

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.64987-16-2,Methyl 2-(2-aminothiazol-4-yl)acetate,as a common compound, the synthetic route is as follows.

Step A: methyl 2-(2-bromothiazol-4-yl)acetate Methyl 2-(2-aminothiazol-4-yl)acetate (5g, 26.8mmol) was added under nitrogen to a solution of copper(ll) bromide (6.77g, 30mmol) and f-butyl nitrite (4.79ml, 40mmol) in acetonitrile (20ml) at -20C. The reaction mixture was slowly warmed to room temperature and stirred for two hours. The solution was then diluted with diethyl ether and washed with 25ml of 10 percent hydrochloric acid solution; the aqueous phase was extracted with 20ml of diethyl ether. The combined organic phases were dried and evaporated to dryness. The residue was purified by a standard method to yield the title compound. LC-MS : m/z (M+H) = = 235.9, 64987-16-2

As the paragraph descriping shows that 64987-16-2 is playing an increasingly important role.

Reference：
Patent; AGIOS PHARMACEUTICALS, INC.; LEMIEUX, Rene M.; CHEN, Yongsheng; WO2014/79136; (2014); A1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

494769-34-5, N-Boc-2-Amino-4-formylthiazole is a thiazole compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated,494769-34-5

Example 43; (a) To a solution commercially available 4-iodopyridine (0.82 g, 4.0 mmol) in 10 mL of THF at 0 C was added a 2M solution of EtMgCl in THF (2.0 mL, 4.0 mmol) dropwise. After 1 h, added a solution of 42b (456 mg, 2.0 mmol) in 5 mL of THF. The reaction was allowed to warm to rt and stirred at for 1 hr. The reaction was quenched with water and extracted 2×EtOAC. The EtOAc extracts were dried over MgSO4, concentrated by rotary evaporator, and chromatographed on SiO2 using 50% hexanes in EtOAc then pure EtOAC to give 138 mg (22%) of 43a. MS found: (M+H)+=308.

As the paragraph descriping shows that 494769-34-5 is playing an increasingly important role.

Reference：
Patent; Sheppeck, James; Dhar, T.G. Murali; Doweyko, Lidia; Gilmore, John; Weinstein, David; Xiao, Hai-Yun; Yang, Bingwei V.; Doweyko, Arthur M.; US2006/154973; (2006); A1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

131106-70-2, 6-(Trifluoromethyl)benzo[d]thiazole is a thiazole compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

21n was dissolved under N2 in EtOH (72 mL). 85% hydrazinehydrate (13.2 g, 223.25 mmol) was added and the mixture wasrefluxed for 3 h. It was then cooled to 0 C and H2O (60 mL) wasadded. 50% acetic acid aqueous solution was added to pH 6e7 andthe mixturewas extracted with DCM. The organic layerwaswashedwith saturated aqueous NaCl and dried over Na2SO4. Then it wasconcentrated to get 5.6 g (Yield 98.2%) of 2-amino-5-(trifluoromethyl)benzenethiol (21m) as a yellow oil without furtherpurification. ES-LCMS m/z: 194.0 (MH).

131106-70-2, As the paragraph descriping shows that 131106-70-2 is playing an increasingly important role.

Reference：
Article; Cao, Hengyi; Zhu, Guangya; Sun, Lin; Chen, Ge; Ma, Xinxin; Luo, Xiao; Zhu, Jidong; European Journal of Medicinal Chemistry; vol. 183; (2019);,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.99073-88-8,Ethyl 2-bromo-6-benzothiazolecarboxylate,as a common compound, the synthetic route is as follows.

Step 3 6-Ethoxycarbonyl-2-mercaptobenzothiazole The crude 2-bromo-6-ethoxycarbonylbenzothiazole (1.90 g, 6.64 mmol) from Step 2 was suspended in absolute ethanol (35 mL) and treated with potassium hydrogen sulfide (0.96 g, 13.3 mmol). The mixture was placed under a nitrogen atmosphere, stirred, and heated in an oil bath at 80 C. The benzothiazole starring material gradually went into solution. After hearing for 30 minutes, the mixture was cooled in an ice bath, treated with 1N hydrochloric acid (13.5 mL), and evaporated under vacuum. The residue was partitioned between ethyl acetate (100 mL) and water (100 mL) and the aqueous phase extracted with more ethyl acetate (50 mL). The combined ethyl acetate solution was washed with brine (50 mL), dried over sodium sulfate, filtered and evaporated under vacuum to a yellow-tan solid (1.56 g). This material was triturated with diethyl ether and dried under vacuum to provide 6-ethoxycarbonyl-2-mercaptobenzothiazole (1.14 g) as a pale tan powder. 1 H NMR (DMSO-d6, 500 MHz) delta1.31 (t, CH3), 3.33 (br s, SH), 4.30(q, CH2), 7.35 (d, H-4), 7.94 (d, H-5), and 8.29 (s, H-7). 13 C NMR (DMSO-d6, 125.7 MHz) delta14.1, 60.9, 112.1,123.2, 125.5, 128.4, 129.7, 144.6, 165.0, and 191.8., 99073-88-8

As the paragraph descriping shows that 99073-88-8 is playing an increasingly important role.

Reference：
Patent; Merck & Co., Inc.; US5538964; (1996); A;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.14527-44-7,Methyl thiazole-5-carboxylate,as a common compound, the synthetic route is as follows.

Part C Preparation of 5-thiazolemethanol To a solution of 11.73 g (82 mmol) of methyl 5-thiazolylcarboxylate in 105 mL of anhydrous tetrahydrofuran at 0 C. under nitrogen, was added 90 mL (90 mmol) of a 1.0M lithium aluminum hydride solution in diethyl ether over a 35 minute period. After stiiring at room temperature for 30 minutes, the solution was cooled to 0 C., and carefully quenched by the addition of 3 mL of water, 3 mL of 20% sodium hydroxide solution, and 6 mL of water, then 100 mL of tetrahydrofuran was added. After stirring for 1 hour, the mixture was filtered, the solid was washed with tetrahydrofuran, and the filtrate concentrated to afford 7.56 g of 5-thiazolylmethanol.

14527-44-7, The synthetic route of 14527-44-7 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; G. D. Searle & Co.; US5968942; (1999); A;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.3622-38-6,2-Chloro-5-nitrobenzo[d]thiazole,as a common compound, the synthetic route is as follows.

Step: 100 mg, 0.67 mmol of benzo[c][1,2]oxaborol-1,5(3H)-diol was dissolved in 8 mL of acetonitrile.Then, 172 mg, 0.8 mmol of 2-chloro-5-nitrobenzothiazole and 329.1 mg, 1.01 mmol of cesium carbonate were added, and the mixture was stirred at 50 ° C overnight, cooled to room temperature, then added with water, and the solid was precipitated, and the crude product solid was prepared. Purification by phase separation to give 5-(5-nitrobenzothiazol-2-oxy)benzo[c][1,2]oxaborol-1(3H)-ol as a white solid 15 mg. The yield was 6.8percent., 3622-38-6

The synthetic route of 3622-38-6 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; Guangzhou Baiting Pharmaceutical Technology Co., Ltd.; Wu Zhong; Li Jingrong; (16 pag.)CN108997394; (2018); A;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.15864-32-1,2-Amino-6-bromobenzothiazole,as a common compound, the synthetic route is as follows.

To a stirred solution of 6-bromobenzo[d]thiazol-2-amine I-2 (229 g, 1.0 mol), pyridine (237 g, 3.0 mol) and DMAP (1.0 g) in anhydrous THF (1800 mL) at 10 C., CH3COCl (87 g, 1.1 mol) was added dropwise and the temperature was kept below 20 C. The resulting mixture was allowed to warm to RT and stirred overnight. The mixture was poured into H2O (2000 mL) and extracted with ethyl acetate (2000 mL). The organic layer was dried over Na2SO4 and filtered. The filtrate was concentrated in vacuo. The crude product was suspended in chloroform (1200 mL), heated to reflux for 20 min. and then cooled to RT. The precipitate was collected by filtration and further dried in vacuo to afford the desired product, N-(6-bromobenzo[d]thiazol-2-yl) acetamide (I-3) (231 g, 85% yield) as a white solid. ESI-MS (M+H)+ m/z: 270.95, 15864-32-1

As the paragraph descriping shows that 15864-32-1 is playing an increasingly important role.

Reference：
Patent; Intellikine LLC; Ren, Pingda; Liu, Yi; Wilson, Troy Edward; Li, Liansheng; Chan, Katrina; US2015/225407; (2015); A1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.3034-53-5,2-Bromothiazole,as a common compound, the synthetic route is as follows.

Example 4 1-phenyl-8-[[2-(2-thiazolyl)phenyl]methyl]-1,3,8-triazaspiro[4.5]decan-4-one (Compound 24) Step A: To a mixture of 2-bromothiazole (826 mg, 4.99 mmol) and tetrakis(triphenylphosphine) palladium (0) (175 mg, 0.151 mmol) in 1,2-dimethoxyethane (20 mL) was added 2-formylbenzeneboronic acid (0.9017 g, 6.01 mmol) and 1 N aqueous NaHCO3 (8 mL). The resultant mixture was heated at reflux for 6 hrs. The reaction mixture was diluted with water and extracted with EtOAc (2 X 50 mL). The organic solution was dried over Na2SO4, filtered and concentrated. The crude product was purified by gradient flash chromatography (10% to 25% EtOAc in hexane) to yield 2-(2-thiazolyl)benzaldehyde as a white solid. MS (loop pos) MH+ = 190.1 1 H NMR (300 MHz, CDCl3) 7.50 (m, 1 H), 7.55-7.60 (m, 1 H), 7.65-7.70 (m, 1 H), 7.75-7.80 (m, 1 H), 7.95-7.97 (m, 1 H), 8.00-8.05 (m, 1 H), 10.5 (s, 1 H)

3034-53-5, The synthetic route of 3034-53-5 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; Janssen Pharmaceuticals, Inc.; JORDAN, Alfonzo; PAN, Kevin; REITZ, Allen, B.; (71 pag.)EP1392687; (2017); B1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

939-69-5, 6-Hydroxybenzo[d]thiazole-2-carbonitrile is a thiazole compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

939-69-5, Method A: Preparation of a 5-Oxymethyl-D-Luciferin Cycloheximide Conjugate [00190] 5-Hydroxymethyl-D-Luciferin. A modification of the procedure of Seto, S., et al., 1963 is used. A mixture of 2-Cyano-6-hydroxybenzthiazole (200 mg), ?-hydroxymethyl D-Cysteine (200 mg), potassium carbonate (160 mg) and 50% aqueous methanol (10 mL) is stirred under a stream of nitrogen gas, at room temperature for 2.5 hours. After neutralization with 1 N aqueous HCl, the precipitate is collected, washed with water and recrystallized from 95% ethanol to give the title compound. [00191] 6′-O-t-butyldimethylsilyl-5-hydroxymethyl-D-Luciferin, t-butyldimethylsilyl ester. Under anhydrous conditions. 5-hydroxymethyl-D-Luciferin (45mg, 0.145 mmole) is dissolved in anhydrous dimethylformamide (7 mL), cooled to 0 C. (ice-bath) and imidazole (300 muL) and t-butyldimethylsilyl chloride solution (50% solution in tetrahydrofuran, 52 muL, 2.1 equiv.) is added. The reaction mixture is allowed to stir at 0 C. for 2 hours and at room temperature overnight. The major product is purified by silicagel column chromatography using dichloromethane:ethylacetate gradient elution. Fractions containing the first major product to elute from the column are combined and evaporated to give the title compound as a white solid.

939-69-5 6-Hydroxybenzo[d]thiazole-2-carbonitrile 9881912, athiazole compound, is more and more widely used in various fields.

Reference：
Patent; Marker Gene Technologies, Inc.; US6656917; (2003); B1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.3622-35-3,Benzo[d]thiazole-6-carboxylic acid,as a common compound, the synthetic route is as follows.

A solution of benzothiazole-6-carboxylic acid (4.48 g, 25.0 mmol), tert-butyl carbazate (3.63 g, 27.5 mmol), 3-(3-dimethylaminopropyl)-1-ethylcarbodiimide hydrochloride (5.75 g, 30.0 mmol) and 1-hydroxybenzotriazole (4.05 g, 30.0 mmol) in N,N-dimethylformamide (50 mL) was stirred overnight at room temperature. The reaction mixture was diluted with ethyl acetate, washed twice with water and once with saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography (ethyl acetate/tetrahydrofuran=2/1), and crystallized from hexane/acetone to give the title compound (5.51 g, yield 75%) as colorless crystals. melting point 128-129 C.1NMR (CDCl3) delta 1.52 (9H, s), 6.81 (1H, brs), 7.89 (1H, dd, J=1.7, 8.7 Hz), 8.12 (1H, d, J=8.7 Hz), 8.40 (1H, brs), 8.47 (1H, dd, J=0.6, 1.7 Hz), 9.12 (1H, s).Elemental analysis (for C13H15N3O3S)Calculated (%): C, 53.23; H, 5.15; N, 14.32.Found (%): C, 53.10; H, 5.13; N, 14.38., 3622-35-3

The synthetic route of 3622-35-3 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; Itoh, Fumio; US2010/69381; (2010); A1;,
Thiazole | C3H3NS – PubChem
Thiazole | chemical compound | Britannica