作者:Pieter A. Otten、Njord Oskam、Arne van der Gen
DOI:10.1016/0040-4020(96)00626-6
日期:1996.8
The synthesis of S,N-acetals of formyldiphenylphosphine oxide 2 is described. The stable lithiated anions of these acetals were applied in a Horner-Wittig reaction with several structural types of aldehydes. The resulting S,N-ketene acetals 1 were obtained in excellent yields. Ketones and pivaldehyde did not react with the sterically hindered phosphine oxide anions. S,N-ketene acetals 1 were found
描述了甲酰基二苯基膦氧化物2的S,N-缩醛的合成。这些缩醛的稳定锂化阴离子与几种结构类型的醛一起用于Horner-Wittig反应中。以优异的产率获得了所得的S,N-烯酮缩醛1。酮和四乙醛不会与空间受阻的氧化膦阴离子反应。发现S,N-乙烯酮缩醛1在中等酸性条件下被选择性水解为相应的(S)-硫酯5。S的先前未描述的反应性,Ñ -ketene缩醛1所允许的醛的两步转化成同源的(小号)-thioesters 5以良好的收率。