Synthesis of diastereoisomeric pairs of novel analogues of d4T having an isochroman glycon moiety; their enzymatic kinetic resolution, their enantiopure synthesis, molecular modeling and NMR structural study
作者:Christophe Len、Serge Pilard、Emmanuelle Lipka、Claude Vaccher、Marie-Pierre Dubois、Yana Shrinska、Vinh Tran、Claude Rabiller
DOI:10.1016/j.tet.2005.07.084
日期:2005.10
An efficient route, starting from 2-bromobenzaldehyde, is described to synthesize racemic diastereoisomeric thymine derivatives of isochroman, which are aromatic analogues of Stavudine, an approved anti-HIV drug. The relative configurations were determined by NOE proton NMR experiments in connection with molecular modeling. Following the separation of the latter diastereoisomers, kinetic resolution
描述了一种从2-溴苯甲醛开始的有效途径,可合成异色满的外消旋非对映异构胸腺嘧啶衍生物,它们是已获批准的抗HIV药物斯塔夫定的芳香类似物。相对构型通过结合分子建模的NOE质子NMR实验确定。分离后一种非对映异构体后,通过脂肪酶催化的酯交换反应实现动力学拆分。使用这种方法,获得了中等ee(0.74-0.98)。因此,提出了从d-甘露糖醇开始的替代策略以提供纯对映体。绝对构型的归因是基于从d-甘露糖醇获得的构型,通过化学过滤进行的。