Betti's base for crystallization-induced deracemization of substituted aldehydes: synthesis of enantiopure amorolfine and fenpropimorph
作者:Andrea Carella、Gabriel Ramos Ferronatto、Emanuela Marotta、Andrea Mazzanti、Paolo Righi、Claudio Paolucci
DOI:10.1039/c6ob02765b
日期:——
diastereoisomer transformation (CIDT) of naphthoxazines derived from racemic O-protected 2-substituted 4-hydroxybutyraldehydes and enantiopure Betti's base allows the deracemization of the starting aldehydes with ee up to 96%. As an alternative, reduction with lithium aluminum hydride of the diastereoisomerically enriched naphthoxazines leads to enantioenriched primary amines. The utility of the latter strategy
由外消旋的O-保护的2-取代的4-羟基丁醛和对映体纯的Betti's碱衍生的萘并恶嗪的酸促进结晶诱导的非对映异构体转化(CIDT)可以使起始醛与ee的反硝化作用高达96%。或者,用氢化锂铝将非对映异构体富集的萘并恶嗪还原可得到对映体富集的伯胺。后一种方法的实用性通过将其应用于对映体富集的苯丙咪唑和ee高达99.5%的对映体纯阿莫罗芬的首次合成得到了证明。