Rhodium(I)-Catalyzed Cyclization of Allenynes with a Carbonyl Group through Unusual Insertion of a CO Bond into a Rhodacycle Intermediate
作者:Yoshihiro Oonishi、Takayuki Yokoe、Akihito Hosotani、Yoshihiro Sato
DOI:10.1002/anie.201308824
日期:2014.1.20
Rhodium(I)‐catalyzed cyclization of allenynes with a tethered carbonyl group was investigated. An unusual insertion of a CO bond into the C(sp2)–rhodium bond of a rhodacycle intermediate occurs via a highly strained transition state. Direct reductive elimination from the obtained rhodacyle intermediate proceeds to give a tricyclic product containing an 8‐oxabicyclo[3.2.1]octane skeleton, while β‐hydride
研究了铑(I)催化的带有连接的羰基的烯丙炔的环化反应。CO键不寻常地插入到rhodacycle中间体的C(sp 2)-铑键中是通过高度应变的过渡态发生的。从所得的罗得酰基中间体中直接还原消除,得到的三环产物包含8-氧杂双环[3.2.1]辛烷骨架,而从同一中间体中除去β-氢化物,则得到的产物中含有稠合的五元和七元环产量。