Synthesis of a Calicheamicin Deoxyaglycone Model by an Intramolecular Acetylide Cyclization
作者:Andrew S. Kende、Cynthia A. Smith
DOI:10.1016/s0040-4039(00)80458-x
日期:1988.1
cyclization to the epimeric carbinols 17 comprising a deoxyaglycone model for the calicheamicins. NOE studies permit stereochemical assignments for these epimers, which in turn suggest that C-8 stereochemistry (calicheamicin numbering) assigned for the calicheamicins may require revision.
烯二炔醛16与LiN(SiMe 3)2的反应导致分子内乙炔化物环化为包含加里车霉素的脱氧糖苷酮模型的差向异构甲醇17。NOE研究允许对这些差向异构体进行立体化学分配,这反过来提示,针对加利车霉素的C-8立体化学(加里车霉素编号)可能需要修改。