Ipso selectivity in the reductive iodonio-Claisen rearrangement of allenyl(p-methoxyaryl)iodinanes
作者:Masahito Ochiai、Takao Ito、Yukio Masaki
DOI:10.1039/c39920000015
日期:——
Allenyl(aryl)iodinanes, generated from p-methoxy(diacetoxyiodo)arenes by the reaction with propyn-2-yl(trimethyl)silanes in the presence of BF3–Et2O in dichloromethane, undergo reductive ipso iodonio-Claisen rearrangement selectivity at –20 °C yielding ipso-substituted propynylarenes.
在二氯甲烷中,在 BF3-Et2O 的存在下,通过与丙炔-2-基(三甲基)硅烷反应生成的对甲氧基(二乙酰氧基碘)烯丙基(芳基)碘烷,在 -20 °C 下发生还原性异碘-克莱森重排选择性反应,生成异取代的丙炔基烯丙基醚。
Solvent Effects on Ipso versus Ortho Selectivity in the Reductive Iodonio-Claisen Rearrangement of Allenyl(p-methoxyphenyl)iodane
作者:Masahito Ochiai、Takao Ito
DOI:10.1021/jo00112a061
日期:1995.4
The Coming of Age in Iodane‐Guided
<i>ortho</i>
‐C−H Propargylation: From Insight to Synthetic Potential
reported that an acid‐activated form of phenyliodine diacetate, PhI(OAc)2, undergoes a reaction with propargyl‐silanes, germanes and stannanes to give the ortho‐propargyl iodobenzene. This formal C−H alkylation was proposed to take place through an unusual (even to date) iodonio‐based [3,3] rearrangement of an intermediate allenylsilane. Although this mechanistic principle has been invoked in related