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
Synthetic studies toward gelsemine. 2. Preparation of the tetracyclic skeletal part by way of a highly stereospecific intramolecular reaction of a silyl enol ether with an N-acyliminium ion
作者:Henk Hiemstra、Robert Jan Vijn、W. Nico Speckamp
DOI:10.1021/jo00251a049
日期:1988.8
.alpha.-acylamino radical cyclizations: application to the synthesis of a tetracyclic substructure of gelsemine