Rhodium-Catalyzed Carbocyclization and Chlorosulfonylation of 1,6-Enynes with Sulfonyl Chlorides
作者:Chen Chen、Jianhua Su、Xiaofeng Tong
DOI:10.1002/chem.201204039
日期:2013.4.15
Linked in: A rhodium(I) catalyst system [[Rh(cod)Cl]+DPPF] enables carbocyclization and chlorosulfonylation of 1,6‐enynes with sulfonyl chlorides, thus allowing the formation of three different bonds (CCl, CC, and CS) in a one‐step fashion (see scheme; cod=cyclooctadiene, DPPF=1,1′‐bis(diphenylphosphino)ferrocene). Sulfonyl chlorides are shown to be an efficient linker in this transformation, which
Copper/Iron‐Cocatalyzed Cascade Perfluoroalkylation/Cyclization of 1,6‐Enynes with Iodoperfluoroalkanes
作者:Xiao‐Feng Xia、Jipan Yu、Dawei Wang
DOI:10.1002/adsc.201701258
日期:2018.2
with readily available iodoperfluoroalkanes reagents for the synthesis of the corresponding fluoroalkylated pyrrolidines and benzofuran derivatives is reported. This novel protocol provides a mild method for the construction of Csp3‐CF2 and exocyclicdoublebonds in one step with high regio‐ and stereo‐selectivities.
A radical hydroalkylative cyclization approach accessing various alkenyl heterocyclic compounds was developed using dimethyl malonate and 1,6-enynes in the presence of visible-light photoredox catalysis. The use of Ir(dtbbpy)(ppy)2PF6 as a photosensitizer enables carbon atom radical formation and initiates the cascade cyclization reaction under mild conditions.
Visible‐Light‐Driven Base‐Promoted Radical Cascade Difluoroalkylation‐Cyclization‐Iodination of 1,6‐Enynes with Ethyl Difluoroiodoacetate
作者:Yan Wang、Ruyan Liu、Pengsheng Zhou、Jianglong Wu、Wenshuang Li、Chenyu Wang、Hao Li、Dianjun Li、Jinhui Yang
DOI:10.1002/ejoc.202101395
日期:2022.2.4
AbstractA visible‐light‐driven base‐promoted radical cascade difluoroalkylation/5‐exo‐dig cyclization/iodination of 1,6‐enynes with ethyl difluoroiodoacetate was developed under catalyst‐free and oxidant‐free conditions. The difluoroalkylated pyrrolidines and tetrahydrofuran derivatives were generated with good functional group tolerance and high Z/E stereoselectivity. This reaction provided an alternative and mild method for the preparation of highly functionalized and vinyl C−I bonds containing five‐membered heterocyclic products.