2-Methyl-5-thiazolecarboxylic acid

b) 2-Methyl-thiazole-5-carboxylic acid To a stirred solution of 2-methyl-thiazole-5-carboxylic acid ethyl ester (1.3 g, 8.0 mmol) in dioxane (12 mL) at room temperature was added NaOH (2N, 12 mL). After 1 h the reaction mixture was neutralized with HCl (IN, 12 mL), then filtered and the collected solid dried in vacuo to give the title compound (758 mg, 70percent) as an off white solid. MS: m/e = 142.0 [M-H]To a stirred solution of compound 97 (41 g, 239.76 mmol) in THF: HTo a 0° C. solution of ethyl 2-methyl-thiazole-5-carboxylate (15 g, 88 mmol) in tetrahydrofuran (50 mL) was added aqueous sodium hydroxide solution (5 N, 50 mL) over 10 minutes, and the resulting solution was stirred at room temperature for another 2 hours. To a 0°C. solution of ethyl 2-methyl-thiazole-5-carboxylate (15 g, 88 mmol) in tetrahydrofuran (50 ml) was added aqueous sodium hydroxide solution (5 N, 50ml) over 10 minutes, and the resulting solution was stirred at room temperature for another 2 hours. It was then acidified with hydrochloric acid (2 N) to pH=1 and extracted with tetrahydrofuran (3x100 ml). The combined organic layers were washed with brine (30 mL) and dried over sodium sulfate. Most of the solvents were removed under reduced pressure and the residue was lyophilized to afford Compound (E) (14g).To a 0° C. solution of ethyl 2-methyl-thiazole-5-carboxylate (15 g, 88 mmol) in tetrahydrofuran (50 mL) was added aqueous sodium hydroxide solution (5 N, 50 mL) over 10 minutes, and the resulting solution was stirred at room temperature for another 2 hours. It was then acidified with hydrochloric acid (2 N) to pH=1 and extracted with tetrahydrofuran (3×100 mL). The combined organic layers were washed with brine (30 mL) and dried over sodium sulfate. Most of the solvents were removed under reduced pressure and the residue was lyophilized to afford Compound (E) (14 g).To the stirred solution of

Molecular Weight:143.17
XLogP3:1.2
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:1
Exact Mass:143.00409958
Monoisotopic Mass:143.00409958
Topological Polar Surface Area:78.4
Heavy Atom Count:9
Complexity:128
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes