反应详情

A mixture of 4.0 g of 1-amidino-4-piperidinepropionic acid hydrochloride, 2.0 g of p-cyanophenol and 3.5 g of dicyclohexylcarbodiimide was stirred overnight at room temperature in 20 ml of dry pyridine. Any insoluble materials were filtered, washed with pyridine and extracted with a solution of 20 ml of water and 20 ml of t-butanol, followed by stirring for about 20 minutes. The filtrate, washings and extract were combined together, and the solvent was removed under reduced pressure. The residue was recrystallized from water to obtain 3.4 g (yield: 59%) of p-cyanophenyl 1-amidino-4-piperidinepropionate hydrochloride as colorless crystals having a melting point of 164.5° to 169° C.

1. filtrationAny insoluble materials were filtered
2. washwashed with pyridine
3. extractionextracted with a solution of 20 ml of water and 20 ml of t-butanol
4. extractionThe filtrate, washings and extract
5. customthe solvent was removed under reduced pressure
6. customThe residue was recrystallized from water