Rhodium-catalyzed cycloaddition of 1,6-enynes with 2-bromophenylboronic acids: synthesis of a multi-substituted dihydronaphthalene scaffold
作者:Xianjie Fang、Chaolong Li、Xiaofeng Tong
DOI:10.1039/b910532h
日期:——
A formal [2 + 2 + 2] cycloaddition of a 1,6-enyne with 2-bromophenylboronic acid has been realized to construct a multi-substituted dihydronaphthalene scaffold, in which the direct reductive elimination mechanism of aryl-Rh(III)-Csp3 species has been established to form an aryl-Csp3 bond.
Structural factors affecting the selectivities in the palladium (II) catalyzed cyclization of N-alkenyl-2-alkynamides
作者:Huanfeng Jiang、Shengming Ma、Guoxin Zhu、Xiyan Lu
DOI:10.1016/0040-4020(96)00648-5
日期:1996.8
Palladiumcatalyzedcyclization of N-alkenyl 2-alkynamides occurred smoothly in the presence of CuCl2 and LiCl affording α-chloroalkylidene-γ-butyrolactams and α-chloroalkylidene-δ-valerolactams valerolactams stereoselectively. The regioselectivity of the intramolecular C-C double bond insertion was influenced by the substituent group on the substrate. When an alkyl group was introduced into the 1'-position