Catalytic Enantioselective Synthesis of (20S)-Camptothecin Intermediates Using Cyanosilylation of Ketones Promoted by D-Glucose-derived Lanthanide Catalyst
作者:Masakatsu Shibasaki、Kazuo Yabu、Shuji Masumoto、Motomu Kanai、Wu Du、Dennis P. Curran
DOI:10.3987/com-02-s49
日期:——
An efficient catalyticenantioselective synthetic route was developed for Curran's versatile camptothecin intermediate (5). The key step is the catalyticenantioselectivecyanosilylation of ketone (7) using a chiral samarium (Sm) complex. The target ketone cyanohydrin (6) was obtained with 90% ee using 2 mol % of the catalyst. A gadolinium (Gd) complex derived from the same chiral ligand could also
Studies toward practical synthesis of (20S)-camptothecin family through catalytic enantioselective cyanosilylation of ketones: improved catalyst efficiency by ligand-tuning
作者:Kazuo Yabu、Shuji Masumoto、Motomu Kanai、Dennis P. Curran、Masakatsu Shibasaki
DOI:10.1016/s0040-4039(02)00451-3
日期:2002.4
Enantioselective catalyst efficiency for the synthesis of the camptothecin family was improved through ligand-tuning. Key intermediates of two convergentsyntheses of camptothecin (Curran's intermediate and Corey's intermediate) were obtained in up to 10 g scale through the catalytic enantioselective cyanosilylation of ketones.