Relationship between the Configurations of 2-Phenyltetrahydrothiophenium 1-Methylides and Their Rearrangement Products
作者:Kazuhiko Fujiwara、Yasuhiro Maeda、Naohiro Shirai、Yoshiro Sato
DOI:10.1021/jo0007377
日期:2000.10.1
nium salt (trans-2), gave a mixture of 1,4,5,10a-tetrahydro-3H-2-benzothiocine (4) ([2,3]sigmatropic rearrangement product) and 4-methylsulfanyl-1-phenyl-1-butene (5) (Hofmann elimination product). Ylide trans-3 cannot undergo [2,3]sigmatropic rearrangement because the ylide-carbon is too far from the phenyl group, and trans-3 would instead isomerize to cis-3. In this paper, we discuss the mechanism
反式-2-苯基四氢噻吩1-甲基化物(trans-3)是由氟离子诱导的反式-2-苯基-1-[[(三甲基甲硅烷基)甲基]四氢噻吩盐(trans-2)的甲硅烷基化反应生成的, 1,4,5,10a-四氢-3H-2-苯并硫辛(4)([2,3]σ重排产物)和4-甲基硫烷基-1-苯基-1-丁烯(5)(霍夫曼消除产物)。ylide trans-3不能进行[2,3]σ重排,因为ylide-碳距离苯基太远,而trans-3会异构化为cis-3。在本文中,我们讨论了反式3到顺式3异构化的机理。