Alkenes from β-lithiooxyphosphonium ylides generated by trapping α-lithiated terminal epoxides with triphenylphosphine
作者:David M Hodgson、Rosanne S D Persaud
DOI:10.3762/bjoc.8.219
日期:——
Terminal epoxides undergo lithium 2,2,6,6-tetramethylpiperidide-induced alpha-lithiation and subsequent interception with Ph(3)P to provide a new and direct entry to beta-lithiooxyphosphonium ylides. The intermediacy of such an ylide is demonstrated by representative alkene-forming reactions with chloromethyl pivalate, benzaldehyde and CD(3)OD, giving a Z-allylic pivalate, a conjugated E-allylic alcohol
终端环氧化物经历锂 2,2,6,6-四甲基哌啶诱导的 α-锂化和随后的截获与 Ph(3)P 以提供新的和直接进入 beta-lithiooxyphosphonium 叶立德。通过与新戊酸氯甲酯、苯甲醛和 CD(3)OD 的代表性烯烃形成反应证明了这种叶立德的中间体,分别以适度的方式产生 Z-烯丙基新戊酸酯、共轭 E-烯丙醇和部分氘化的末端烯烃产量。