Mild and Stereoconvergent Palladium-Catalyzed Carbonyl Alkenation Reaction of α,β-Unsaturated Aldehydes
作者:Manfred Braun、Stefan Mroß、Ido Schwarz
DOI:10.1055/s-1998-1995
日期:1998.1
The addition of preformed ketone and ester enolates to α,β-unsaturated aldehydes 1 followed by in situ protection leads to the carbonates 3, 7, 8, 11, and 13. They are converted into sensitive functionalized dienes 4, 9, 12, and 14 by a smooth palladium-catalyzed elimination. Both syn- and anti-carbonates 7 and 8 lead to E-dienes 9 in a stereoconvergent manner.
在α,β-不饱和醛1中加入预制的酮和酯烯醇,然后进行原位保护,可得到碳酸酯3、7、8、11和13。通过钯催化消除反应,它们可转化为敏感的官能化二烯4、9、12和14。顺式和反式碳酸酯7和8均以立体异构方式转化为E-二烯9。