反应详情

1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.0 g, 5.2 mmol, 2 eq) was added to a mixture of 2-amino-5-[[[5-(1,1-dimethylethyl)-2-oxazolyl]methyl]thio]thiazole (0.7 g, 2.6 mmol, 1 eq), 1-(1-methylethyl)-4-piperidine carboxylic acid (0.78 g, 3.9 mmol, 1.5 eq), 4-(dimethylamino)pyridine (0.16 g, 1.3 mmol, 0.5 eq), N,N-dimethylformamide (2.6 mL) and CH2Cl2 (7.8 mL). The reaction mixture was stirred at rt for 1 h, diluted with 30 mL of water and extracted with ethyl acetate (2×70 mL). The organic extracts were dried over Na2SO4, concentrated in vacuo, and purified by flash chromatography on silica gel eluting with a gradient of 5-10% triethylamine in ethyl acetate. The material was recrystallized from ethanol and water to provide 0.93 g (85%) of N-[5-[[[5-(1,1-dimethylethyl)-2-oxazolyl]methyl]thio]-2-thiazolyl]- 1-(1-methylethyl)-4-piperidinecarboxamide as a yellowish solid. MS: 423 [M+H]+; HPLC: 100% at 3.15 min (YMC S5 ODS column 4.6×50 mm, 10-90% aqueous methanol over 4 minutes containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm).

1. extractionextracted with ethyl acetate (2×70 mL)
2. dry with materialThe organic extracts were dried over Na2SO4
3. concentrationconcentrated in vacuo
4. custompurified by flash chromatography on silica gel eluting with a gradient of 5-10% triethylamine in ethyl acetate
5. customThe material was recrystallized from ethanol and water