反应详情

220 mg of 2-guanidino-4-methyl-thiazole-5-carboxylic acid, 265 mg of ethyl (RS)-3-[(piperidine-3-carbonyl)-amino]-propionate hydrochloride, 3 ml of DMF, 0.34 ml of N-methylmorpholine (N-MM) and 569 mg of O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate (HBTU) are stirred at RT for 22 hours. The reaction mixture is diluted with ethyl acetate and washed firstly with a dilute aqueous solution of sodium carbonate and sodium chloride, then with dilute sodium chloride solution and finally with saturated sodium chloride solution. The organic phase is dried over sodium sulphate and evaporated in a vacuum. Chromatography on silica gel with ethyl acetate: ethanol 5:1 gives 270 mg of ethyl (RS)-3-[[1-(2-guanidino-4-methyl-thiazole-5-carbonyl)-piperidine-3-carbonyl]-amino]-propionate as a pale yellow foam. MS: 411 (M+H)+.

1. washwashed firstly with a dilute aqueous solution of sodium carbonate and sodium chloride
2. dry with materialThe organic phase is dried over sodium sulphate
3. customevaporated in a vacuum