Synthesis and the absolute configuration of both enantiomers of 4,5-dihydroxy-3-(formyl)cyclopent-2-enone acetonide as a new chiral building block for prostanoid synthesis
作者:Beata Łukasik、Marian Mikołajczyk、Grzegorz Bujacz、Remigiusz Żurawiński
DOI:10.1039/c4ob01535e
日期:——
The synthesis of both enantiomers of 4,5-dihydroxy-3-(formyl)cyclopent-2-enone acetonide (5) was accomplished in five steps starting from meso-tartaric acid (6). The key steps involved are preparation of the isopropylidene protected 3-[(dimethoxyphosphoryl)methyl]-4,5-dihydroxycyclopent-2-enone (9), resolution of the diastereoisomeric products 10 of the Horner reaction of racemic 9 with (R)-glyceraldehyde
的4,5-二羟基-3-(甲酰基)两种对映体的合成环戊-2-烯酮丙酮(5)在从开始的五个步骤来实现内消旋-酒石酸(6)。涉及的关键步骤是制备异亚丙基保护的3-[((二甲氧基磷酰基)甲基] -4,5-二羟基环戊-2-烯酮(9),拆分外消旋体9与(R)-的霍纳反应的非对映异构产物10。甘油醛丙酮化物和分离二烯酮的环外碳-碳双键的最终区域选择性臭氧分解10导致两种对映体标题化合物5。两种对映异构体的绝对构型最初是根据从DFT计算获得的手性与实验数据进行比较后确定的,最后通过X射线分析确定。