Method of preparing ascorbic acid and intermediates specially adapted for use therein
申请人:PFIZER INC.
公开号:EP0000092A1
公开(公告)日:1978-12-20
The invention relates to a process for preparing ascorbic acid in which (a) gulono-, galactono-, idono- or talono-1,4- lactone is reacted with at least one hydroxyl-protecting reagent so as to protected the free hydroxyl groups in the 5-, 6-and either the 2- or 3- positions, or, reacting gulono- or idono-1,4-lactone with at least one hydroxyl-protecting reagent so as to protect the free hydroxyl groups in the 3-, 5- and optionally the 6- positions (b) oxidizing the free hydroxyl group at the 2- or 3- position to oxidize it to an oxo group and (c) hydrolyzing the compound formed in (b) to ascorbic acid. Certain novel intermediates useful in the above process are also covered.
本发明涉及一种制备抗坏血酸的工艺,在该工艺中,(a)古洛内酯、半乳糖内酯、伊东内酯或 Talono-1,4- 内酯与至少一种羟基保护试剂反应,以保护 5-、6-和 2 或 3-位上的游离羟基,或者,古洛内酯或伊东内酯与至少一种羟基保护试剂反应,以保护 3-、5-和可选的 6-位上的游离羟基 (b)氧化游离羟基以制备抗坏血酸、4-内酯与至少一种羟基保护试剂反应,以保护 3-、5-和任选 6-位上的游离羟基 (b) 氧化 2-或 3-位上的游离羟基,使其氧化为氧代基团,以及 (c) 将 (b) 中形成的化合物水解为抗坏血酸。此外,还介绍了在上述工艺中有用的某些新型中间体。