Second-Generation Synthesis of Azadirachtin: A Concise Preparation of the Propargylic Mesylate Fragment
作者:Alistair Boyer、Gemma E. Veitch、Edith Beckmann、Steven V. Ley
DOI:10.1002/anie.200805395
日期:2009.2.2
A second bite of the apple: A new and highly efficient synthesis of the propargylicmesylatefragment of azadirachtin has been accomplished (see scheme; Bn=benzyl, Ms=methanesulfonyl, PMB=para‐methoxybenzyl, TBDPS=tert‐butyldiphenylsilyl). An enantioselective catalytic hetero Diels–Alder reaction sets up the stereocenter at C15, which then controls the installation of the remaining functionality in