The Pd(0)-catalyzed cyclization-carbonylation of 2-methyl-1-vinyl-5,6-heptadienyl acetate regio- and stereoselectively gave an α-cyclopentylacrylic acid derivative which was applied to the sythesis of (±)-isoiridomyrmecin.
Palladium-Catalyzed Three-Component Tandem Cyclization Reaction of 2-(2,3-Allenyl)acylacetates, Organic Halides, and Amines: An Effective Protocol for the Synthesis of 4,5-Dihydro-1H-pyrrole Derivatives
作者:Jiajia Cheng、Xuefeng Jiang、Can Zhu、Shengming Ma
DOI:10.1002/adsc.201100002
日期:2011.7
A domino three‐component reaction of 2‐(2′,3′‐allenyl)acylacetates with aryl or alkenyl halides and aryl‐ or benzylamines afforded 4,5‐dihydro‐1H‐pyrrole derivatives highly chemo‐ and regioselectively in one pot through imine formation/imine‐enamine tautomerization under the catalysis of palladium(0) and toluenesulfonic acid monohydrate. A high diastereoselectivity was observed.
Construction of Cyclic Nitrones Enabled by Photodriven and Gold-Catalyzed 1,3-Azaprotio Transfer of Allenyloximes
作者:Zhenjie Qi、Shaozhong Wang
DOI:10.1021/acs.joc.3c01937
日期:2023.11.3
protocol was developed to construct five- to seven-membered cyclic nitrones through the gold-catalyzed 1,3-azaprotio transfer of allenyloximes under photoirradiation. The photoisomerization of oximes was suggested to convert the inert stereoisomer to a reactive one. This photodriven and gold-catalyzed ring formation could be further extended to the thermodynamically stable aryl ketoximes with an E-configuration