申请人:Thompson-Hayward Chem. Co.
公开号:US03935256A1
公开(公告)日:1976-01-27
An improved process for the preparation of dl-calcium pantothenate is described wherein an anhydrous calcium salt of B-Alanine in methanolic solution is reacted with dl-pantolactone directly in a one-step process. The salt of B-Alanine is prepared by reacting acrylonitrile with ammonia, the B-amino-propionitrile formed is hydrolyzed in 50% sodium hydroxide and the sodium salt reacted with a solution of calcium chloride in a liquid which will form an azeotropic mixture with water, any excess sodium hydroxide is neutralized with hydrochloric acid and the water removed by an azeotropic distillation. The reaction mixture is then taken up in methanol and reacted with the dl-pantolactone directly.
本文描述了一种改进的过程,用于制备dl-泛酸钙,其中无水的B-丙氨酸钙盐在甲醇溶液中与dl-泛酮直接进行一步反应。 B-丙氨酸盐通过用丙烯腈与氨反应制备,形成的B-氨基丙腈在50%氢氧化钠中水解,然后将钠盐与能与水形成共沸混合物的液体中的氯化钙溶液反应,任何过量的氢氧化钠通过盐酸中和,水通过共沸蒸馏去除。 然后将反应混合物溶解在甲醇中,并直接与dl-泛酮反应。