Rhodium‐Catalyzed Tandem Addition–Cyclization of 1,5‐Enynes with Organoboronic Acids for the Synthesis of Alkylidene‐Cyclobutanes
作者:Hyeji Kim、Kyoungmin Choi、Dongseok Jang、Hyun‐Suk Um、Yeehwan Kim、Chulbom Lee
DOI:10.1002/hlca.202100220
日期:2022.2
here is the rhodium(I)-catalyzed tandem addition–cyclization of 1,5-enynes with aryl- and alkenylboronic acids. In the presence of triethylamine and catalytic [Rh(OH)(COD)]2 in methanol, both the terminal and internal alkyne substrates possessing an electron-deficient alkene undergo inter- and intramolecular C−C bondformations to yield alkylidene–cyclobutane products. The reaction proceeds through a
Rhodium-Catalyzed Arylative and Alkenylative Cyclization of 1,5-Enynes Induced by Geminal Carbometalation of Alkynes
作者:Yiyun Chen、Chulbom Lee
DOI:10.1021/ja067125+
日期:2006.12.1
formation of a rhodiumvinylidenecomplex with the terminal alkyne of the enyne substrate. The subsequent migration of the aryl or alkenyl group from the rhodium center to the alpha-carbon of the vinylideneligand gives a vinylrhodiumcomplex, a formal 1,1-carbometalation process of the alkyne. This vinylrhodium then adds to the pendent alkene, and the protodemetalation of the resulting rhodium enolate