申请人:Kumiai Chemical Industry Co., Ltd.
公开号:US04071534A1
公开(公告)日:1978-01-31
A process for producing a mono- or di-alkali metal salt or alkaline earth metal salt of L-ascorbic acid-2-sulfate which comprises reacting L-ascorbic acid in which the 5 and 6 positions are protected by a ketone or aldehyde, with dimethyl formamide-sulfur trioxide complex, which is produced by a reaction of dimethyl formamide with chlorosulfonic acid and a dehydrohalogenating agent such as pyridine, triethylamine, dimethyl aniline, which is a tertiary amine so as to produce a sulfate, and neutralizing the product with an alkali metal hydroxide or an alkaline earth metal hydroxide, and removing said protecting aldehyde or ketone at 5- and 6-positions.
一种制备L-抗坏血酸-2-硫酸盐的单或双碱金属盐或碱土金属盐的方法,包括将L-抗坏血酸与二甲基甲酰胺-三氧化硫复合物反应,其中5和6位置被酮或醛保护,该复合物是由二甲基甲酰胺与氯磺酸和去卤化剂(如吡啶、三乙胺、二甲基苯胺)反应而成的,以产生硫酸盐,并使用碱金属氢氧化物或碱土金属氢氧化物对产物进行中和,并去除5-和6-位置的保护醛或酮。