A Michael Addition and Peterson Olefination Sequence Using 1-Silylethenyl Sulfides and Sulfoxide
作者:Shuji Kanemasa、Hiroshi Kobayashi、Junji Tanaka、Otohiko Tsuge
DOI:10.1246/bcsj.61.3957
日期:1988.11
Reaction of organolithiums with a 1-(trimethylsilyl)ethenyl sulfide produces 1,2-bis(trimethylsilyl)cyclopropanes, while use of 1-silylethenyl sulfides bearing a bulkier silyl moiety results in exclusive formation of the corresponding Michael adduct anions which are then quenched with aldehydes to give vinyl sulfides. On the contrary, a 1-(trimethylsilyl)ethenyl sulfoxide undergoes smooth Michael addition with a variety of organo-metallics and the resulting carbanion intermediates can be quenched with aldehydes to produce vinyl sulfoxides. Scope and limitations of these sequential reactions are discussed.
有机锂与 1-(三甲基硅烷基)乙烯基硫醚反应可生成 1,2-双(三甲基硅烷基)环丙烷,而使用带有较多硅基的 1-硅烷基乙烯基硫醚则只能形成相应的迈克尔加成阴离子,然后用醛淬灭,生成乙烯基硫化物。相反,1-(三甲基硅烷基)乙烯基亚砜会与多种有机金属发生顺畅的迈克尔加成反应,生成的碳阴离子中间体可以用醛淬灭,生成乙烯基硫醚。本文讨论了这些连续反应的范围和局限性。