Synthesis of ketene (S, Te)acetals and their transformation into Z-α-phenylthio-α,β-unsaturated aldehydes
作者:Claudio C Silveira、Gelson Perin、Antonio L Braga、Miguel J Dabdoub、Raquel G Jacob
DOI:10.1016/s0040-4020(99)00389-0
日期:1999.6
phosphonates with aryl (or butyl) tellurenyl halides and aldehydes under basic conditions provides moderate to good yields of ketene thio (telluro) acetals, with vinylic sulfides being byproducts of this transformation. Tellurium-lithium exchange by reaction with n-BuLi yielded vinyl organolithium species, which were captured with several electrophiles. In the case of DMF, Z-α-phenylthio-α,β-unsaturated
在碱性条件下,硫代甲基膦酸酯与芳基(或丁基)碲基卤化物和醛的反应可提供中等到良好的乙烯酮硫代(缩醛)乙缩醛收率,而乙烯基硫化物是这种转化的副产品。通过与正丁基锂反应进行碲-锂交换,得到乙烯基有机锂物质,该乙烯基有机锂物质被几种亲电试剂捕获。在DMF的情况下,获得Z-α-苯硫基-α,β-不饱和醛。