The direct resolution of (3aRS, 6SR, 6aSR)-1, 3-dibenzyl-6-hydroxy-3, 3a, 6, 6a-tetrahydro-1H-furo[3, 4-d]imidazole-2, 4-dione [(±)-9], a key intermediate for biotin, with optically active amines was examined. Reaction of (±)-9 with cinchonidine readili gave the cinchonidine salt of the (4S, 5R)-aldehyde-carboxylic acid (12), acidification of which gave (3aS.6R, 6aR)-9, convertible to biothin. N-alkyl-D-glucamines (14) were also found to be effective resolving agents for (±)-9 applicable for industrial use. Reutilizatin of the unwanted epimer [(3aR, 6S, 6aS)-9] was effected by facile oxidation to the meso-diacid (3) with sodium chlorite.
研究了(3aRS, 6SR, 6aSR)-1, 3-二苄基-6-羟基-3, 3a, 6, 6a-四氢-1H-
呋喃并[3, 4-d]
咪唑-2, 4-二酮[(±)-9](一种
生物素的关键中间体)与光学活性胺的直接解析。(±)-9与
辛可尼丁反应后得到
辛可尼丁盐的(4S, 5R)-醛
羧酸(12),酸化后得到(3aS.6R, 6aR)-9,可转化为
生物素。研究还发现,N-烷基-D-葡胺(14)是可用于工业用途的(±)-9 的有效分解剂。用
亚氯酸钠简单地氧化成中二元酸(3),可以重新利用不需要的外延物[(3aR, 6S, 6aS)-9]。