Reactivity of substituted and unsubstituted diphenylphosphonium diylides towards carbonic acids derivatives
作者:H.J. Cristau、M. Taillefer
DOI:10.1016/s0040-4020(97)10360-x
日期:1998.2
delimit the scope of application of diphenylphosphonium diylides, their reactivity towards carbonic acid derivatives was investigated. Non-stabilized diylides react with ethyl carbonate to give new monoylide intermediates which lead, by in situ Wittig reaction with carbonyl compounds, to the synthesis of α,β-unsaturated esters or acids the double bond being di- or trisubstituted. The reaction proceeds in
为了进一步限制二苯基phosph二烷基化物的应用范围,研究了它们对碳酸衍生物的反应性。未稳定的二亚烷基化物与碳酸乙酯反应,生成新的单酰化物中间体,该中间体通过与羰基化合物的原位Wittig反应,导致合成被双或三取代的双键的α,β-不饱和酯或酸。该反应在温和的条件下以高E立体选择性进行。稳定的二亚烷基对碳酸酯无活性,但半稳定的二亚烷基与碳酸乙酯反应,导致合成非官能化的烯烃,而不是α,β-不饱和酯或酸。