Synthesis of (−)-kainic acid using chiral lithium amides in an asymmetric dearomatizing cyclization
作者:Jonathan Clayden、Christel J Menet、Kirill Tchabanenko
DOI:10.1016/s0040-4020(02)00379-4
日期:2002.6
which in some cases may be recrystallised to enantiomeric purity. These isoindolone derivatives are converted in nine steps, among them a surprisingly regioselective Baeyer–Villiger reaction, to (−)-kainic acid.
手性锂酰胺碱能够对映选择性地使N-苄基-N-枯基茴香酰胺脱质子化,以产生对映异构体富集的苄基有机锂。这些自发地进行脱芳构环化反应,得到高对映体过量的对映体富集的部分饱和异吲哚酮,在某些情况下可将其重结晶为对映体纯度。这些异吲哚酮衍生物可以通过九个步骤转化为(-)-海藻酸,其中包括令人惊讶的区域选择性Baeyer-Villiger反应。