Olefination of α,α′-Divinyl Ketones through Catalytic Meyer−Schuster Rearrangement
作者:Curtis J. Rieder、Karl J. Winberg、F. G. West
DOI:10.1021/jo101497f
日期:2011.1.7
followed by catalytic Meyer−Schuster rearrangement has been developed for the olefination of 1,4-pentadien-3-ones to afford [3]dendralenes. Many of the traditional methods for the Meyer−Schuster rearrangement of alkynyl carbinols are not suitable with these highly unsaturated substrates because of their acid sensitivity. Unexpected reactivity during attempted rearrangement, including Nazarov-type electrocyclizations
1,4-二烯-3-酮的直接烯烃化仍然是一个合成难题。已经开发出了两步方案,采用乙炔加成,然后进行催化的Meyer-Schuster重排,以实现1,4-戊二烯-3-酮的烯化反应,从而制得[3]树枝状烯烃。炔基甲醇的迈耶-舒斯特重排的许多传统方法由于其对酸的敏感性而不适用于这些高度不饱和的底物。提出了包括Nazarov型电环化在内的尝试重排过程中的意外反应性,以及利用催化VO(acac)2促进乙氧基乙炔加合物的Meyer-Schuster重排的条件。