Asymmetric total synthesis of (20R)-homocamptothecin, substituted homocamptothecins and homosilatecans
作者:Ana E Gabarda、Wu Du、Thomas Isarno、Raghuram S Tangirala、Dennis P Curran
DOI:10.1016/s0040-4020(02)00632-4
日期:2002.8
An efficient asymmetric synthesis of a key DE lactone pyridone intermediate in the synthesis of homocamptothecin is reported. The synthesis is scalable and features a Stille coupling and a Sharpless asymmetric epoxidation as the key steps. The key intermediate has been parleyed into homocamptothecin and an assortment of fluorinated homocamptothecins and homosilatecans (7-silylhomocamptothecins), thereby providing the first asymmetric entry to this important new class of antitumor agents. (C) 2002 Published by Elsevier Science Ltd.