antitumor agents are currently in phase II clinical trials for the treatment of a variety of forms of cancer. Aldol reactions and directed reductions are among the essential steps for the formation of fragments A-C in the total synthesis of the title compound. Coupling of these fragments by sulfone-based olefination and alkylation reactions was followed by macrocyclization and introduction of the enoate moieties
作者:David A. Evans、Percy H. Carter、Erick M. Carreira、André B. Charette、Joëlle A. Prunet、Mark Lautens
DOI:10.1021/ja990860j
日期:1999.8.1
The total synthesis of the marine macrolide bryostatin 2 is described. The synthesis plan relies on aldol and directed reduction steps in order to construct the anti-1,3-diol array present in each of the principal subunits (A, B, and C). These fragments were coupled using a Juliaolefination and subsequent sulfone alkylation. A series of functionalization reactions provided a bryopyran seco acid, which