反应详情

20 ml of 2 N sodium hydroxide was stirred with ice-cooling, and 3.4 g of o-methylisourea sulfate and 3.1 g of piperidine-4-propionic acid were added to the aqueous sodium hydroxide solution. To the mixture was then added 5 ml of water, and the resulting mixture was stirred at room temperature for 19 hours. The product precipitated was separated by filtration and washed with a small amount of cold water three times, then with acetone and finally with ether to obtain 2.0 g of 1-amidino-4-piperidinepropionic acid as colorless crystals having a melting point of 294° C. (decomposed).

1. temperaturecooling
2. customThe product precipitated
3. customwas separated by filtration
4. washwashed with a small amount of cold water three times