Synthesis of some derivatives of pseudo-α-galactopyranose [(1,2/3,4,5)-5-hydroxymethyl-1,2,3,4-cyclohexanetetrol]
作者:Seiichiro Ogawa、Yasushi Shibata、Keiko Miyazawa、Tatsuhi Toyokuni、Tatsuo Iida、Tetsuo Suami
DOI:10.1016/0008-6215(87)80164-7
日期:1987.6
-isopropylidene derivatives. Several C-7 substituted derivatives of 1 of biological interest have been prepared by nucleophilic displacement reactions of the tosylate derived from the most readily available 1,2:3,4-di- O -isopropylidene derivative 3 . Condensation of 3 with 2,3,4,6-tetra- O -acetyl-α- d -glucopyranosyl bromide gave diastereoisomeric products, which were converted into 7- O -(β- d -glucopyranosyl)-pseudo-α-
摘要在甲苯存在下,N,N-二甲基甲酰胺中的2,2-二甲氧基丙烷与dl-(1,2 / 3,4,5)-5-羟甲基-1,2,3,4-环己烷四醇(1)进行异丙基化-对磺酸得到1,2:3,4-,1,2:4,7-和2,3:4,7-二-O-异亚丙基衍生物。通过从最容易获得的1,2:3,4-二-O-异亚丙基衍生物3衍生的甲苯磺酸酯的亲核取代反应,已经制备了一些具有生物学意义的1的C-7取代衍生物。3与2,3,4,6-四-O-乙酰基-α-d-吡喃葡萄糖基溴的缩合得到非对映异构产物,将其转化为7-O-(β-d-吡喃葡萄糖基)-伪α-d- (26a)和-d-吡喃半乳糖(26B),其结构通过26A的八乙酸酯的降解得到证实,产生已知的伪α-d-吡喃半乳糖五乙酸酯。