Protiodesilylation of 3-trimethylsilyl-2-thiabicyclo[2.2.1]hept-5-enes and derivatives: a stereochemical study
作者:Bianca F. Bonini、Enza Masi、Stefano Masiero、Germana Mazzanti、Paolo Zani
DOI:10.1016/0040-4020(96)00032-4
日期:1996.3
endo- and exo-trimethylsilyl-3-phenyl-2-thiabicyclo[2.2.1]hept-5-enes, the endo-trimethylsilyl-exo-S-oxide and their S,S-dioxide derivatives were protiodesilylated with fluoride ion. Stereoconvergent reactions were found, affording the endo-phenyl derivatives. These results can be rationalised with the hypothesis of a common carbanionic intermediate. In contrast, the desilylation of 3-endo-trimeth
内-和外-三甲基甲硅烷基-3-苯基-2-硫代双环[2.2.1]庚-5-烯,内-三甲基甲硅烷基-外-S-氧化物和它们的S,S-二氧化物衍生物被氟离子巯基甲硅烷基化。发现立体收敛反应,得到内苯基衍生物。可以使用常见的碳负离子中间体的假设来使这些结果合理化。相反,3-内-三甲基甲硅烷基-3-外-苯基-2-硫代双环[2.2.1]庚烷的去甲硅烷基化作用可得到内-和外-异构体的混合物,从而证明了双键参与了对内酯的控制。反应立体选择性。