申请人:Pfizer Inc.
公开号:US04111958A1
公开(公告)日:1978-09-05
Ascorbic acid is prepared from a 1,4-lactone selected from gulono-1,4-lactone, galactono-1,4-lactone, idono-1,4-lactone and talono-1,4-lactone by a process comprising protection of the hydroxyl groups of the lactone so as to form an intermediate having a free hydroxyl group at either, but not both, the 2- or 3-position, oxidizing this free hydroxyl group to a keto group and hydrolyzing the oxidized intermediate to remove the hydroxyl-protecting groups.
抗坏血酸是从古洛酮-1,4-内酯、半乳糖酮-1,4-内酯、异戊糖酮-1,4-内酯和他戊糖酮-1,4-内酯中选择的一种1,4-内酯制备而成,其过程包括保护内酯的羟基,以形成一个中间体,在2-或3-位置之一具有一个自由羟基,然后将这个自由羟基氧化为酮基,最后水解氧化的中间体以去除羟基保护基团。