Novel<i>ortho</i>-Alkoxy-Substituted Phosphorus Ylides and Their Stereoselectivity in Witting Reactions
作者:Suruliappa Jeganathan、Masamitsu Tsukarmoto、Manfred Schlosser
DOI:10.1055/s-1990-26801
日期:——
The stereochemistry of the reactions between tris(2-methoxy-methoxyphenyl)phosphonioethanide (1f), -butanide (2f), and -phenyl-methanide (3f) and a variety of aldehydes was investigated. Ylides having a β-unbranched aliphatic sidechain, such as 2f, and saturated straight-chain aldehydes give olefins with unprecedented cis-selectivity (cis/trans â 200:1).
三(2-甲氧基甲氧基苯基)膦醯電乙烷錘(1f)、-丁烷錘(2f)和-苯甲烷錘(3f)与一系列醛类反应的立体化学被研究了。具有β-无分支脂肪链的叶立德(如2f)和饱和直链醛类产生前所未有的顺式选择性烯烃(顺/反 ≈ 200:1)。