A chiral hexahydroindolizine as key intermediate in the synthesis of tri- and tetrahydroxyindolizidines
作者:Michael Lennartz、Eberhard Steckhan
DOI:10.1016/s0040-4020(00)01034-6
日期:2001.1
The highly stereoselective functionalization of hexahydro-3-oxo-indolizine 6 has been examined. The bishydroxylated product can be transformed successfully into the trihydroxyindolizidine 11 in 57% overall yield. in addition, a simple elimination process to give the a,P-unsaturated lactam 13 and a second highly stereoselective bishydroxylation can be used to synthesise the tetrahydroxyindolizidine 19 in 30% overall yield. (C) 2001 Published by Elsevier Science Ltd.