Regiocontrol of Diels-Alder Reaction of Conjugate 1-Trienol Ether in Chiral Tropilidene with TCNE
作者:Takashi Sugimura、Shinya Nagano、Harumi Kohno、Morifumi Fujita、Akira Tai
DOI:10.1246/cl.1999.179
日期:1999.2
The Diels-Alder reaction of tetracyanoethylene (TCNE) with a 1-trienol unit in the tropilidenes at the 1,4-position was a quick and reversible process, whereas the 3,6-addition only proceeded in polar solvent and was irreversible.
Rapid [1,5] Hydrogen Migration on 7-Alkoxycarbonyltropilidenes under Conformational Regulation
作者:Takashi Sugimura、Harumi Kohno、Shinya Nagano、Futoshi Nishida、Akira Tai
DOI:10.1246/cl.1999.1143
日期:1999.11
The thermal [1,5] hydrogen migration of 7-alkoxycarbonyltropilidene was found to be accelerated by conformational regulation at the carbonyl group, which was mainly affected to the activation energy. Methyl substitutions on the 3- and 5-positions further increased the migration rate.
The First Asymmetric Synthesis of Optically Active Tropilidenes. Highly Regio- and Diastereo-differentiating Addition of Diazo Ester to Aromatic Ring Using 2,4-Pentanediol as Chiral Linking Bridge
作者:Takashi Sugimura、Shinya Nagano、Akira Tai
DOI:10.1246/cl.1998.45
日期:1998.1
Opticallyactive tropilidenes were prepared by cycloaddition of a diazo ester to an aromaticring using 2,4-pentanediol as a chiral linking bridge under complete regio- and stereo-differentiations.