Synthesis of gem-difluoromethylenated analogues of anamarine
摘要:
Practical synthesis of two gem-difluoromethylenated analogues of anamarine was described. The important synthetic steps included the preparation of the key intermediates 20-21 through the indium-mediated gem-difluoropropargylation of aldehyde 18 with the Fluorine-containing building block 19 and efficient construction of alpha,beta-unsaturated-delta-lactone scaffold via BAIB/TEMPO procedure. (C) 2010 Elsevier B.V. All rights reserved.