Synthesis of allenes by [2,3]-sigmatropic rearrangement of prop-2-yn-1-yl oxonium ylides formed in rhodium(II) carboxylate catalysed reactions of diazo compounds
作者:Michael P. Doyle、Vahid Bagheri、E. Elizabeth Claxton
DOI:10.1039/c39900000046
日期:——
oxophilicity of metal carbenes formed in rhodium(II) perfluorobutyrate catalysed decomposition of diazo carbonyl compounds allows selective ylide generation from methyl prop-2-yn-1-yl ethers with resulting allene production through the [2,3]-sigmatropicrearrangement.
The intramolecular addition of a diazo ester group to a triple bond in the presence of chiral dirhodium(II) carboxamidate catalysts gives macrocyclic lactones with a fused cycloproprene ring [Eq. (a)]. This efficient reaction is characterized by high enantiocontrol (up to 98% ee) and chemoselectivity.
Cyclopropenes for the Synthesis of Cyclopropane-Fused Dihydroquinolines and Benzazepines
作者:Hui-Xin Luo、You-Hong Niu、Xiao-Ping Cao、Xin-Shan Ye
DOI:10.1002/adsc.201500203
日期:2015.9.14
for the construction of cyclopropane‐fused dihydroquinolines was established by a novel Povarov‐typethree‐component reaction of aromatic aldehydes, anilines and cyclopropenes in the presence of trifluoromethanesulfonic acid. The reaction proceeded in a regioselective and diastereoselective manner. Furthermore, the dihydroquinolines were smoothly converted to benzazepine derivatives via a ring opening/isomerization