Synthetic studies towards gelsemine, I The importance of the antiperiplanar effect in the highly regioselective reduction of non-symmetrical cis-hexahydrophthalimides
作者:Robert J. Vijn、Henk Hiemstra、Joost J. Kok、Martin Knotter、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)87680-8
日期:1987.1
During studies aimed at the total synthesis of gelsemine an exceptional example of regioselectivity has been discovered. cis-Hexahydrophtnalimides, which are non-symmetrical through the presence of one alkyl group (see Figure 1), are reduced by sodium borohydride into the corresponding hydroxy lactams with very high regioselectivity. The corresponding cis-tetrahydrophthalimides exhibit much lower selectivity
在针对明胶总合成的研究过程中,发现了区域选择性的一个例外实例。顺式-六氢邻苯二甲酰亚胺通过一个烷基的存在而不对称(见图1),被硼氢化钠还原成相应的羟基内酰胺,具有很高的区域选择性。相应的顺式-四氢邻苯二甲酰亚胺显示出低得多的选择性。这些发现是根据酰亚胺分子的构象偏爱和反平面作用进行解释的。