Trisubstituted olefin synthesis <i>via</i> Ni-catalyzed hydroalkylation of internal alkynes with non-activated alkyl halides
作者:Xiao-Yu Lu、Mei-Lan Hong、Hai-Pin Zhou、Yue Wang、Jin-Yu Wang、Xiu-Tao Ge
DOI:10.1039/c8cc01577e
日期:——
The stereoselective synthesis of tri-substituted alkenes is challenging. Herein, we report a Ni-catalyzed regio- and stereo-selective hydroalkylation of internal alkynes with non-activated alkylhalides. This method does not use any sensitive organometallic reagents and shows good functional group compatibility, which enables the efficient synthesis of many tri-substituted olefins from readily available
作者:Yan Li、Deguang Liu、Lei Wan、Jun-Yang Zhang、Xi Lu、Yao Fu
DOI:10.1021/jacs.2c06279
日期:2022.8.3
Regiodivergent alkyne hydroalkylation to generate different isomers of an alkene from the same alkyne starting material would be beneficial; however, it remains a challenge. Herein, we report a ligand-controlledcobalt-catalyzed regiodivergent alkyne hydroalkylation. The sensible selection of bisoxazoline (L1) and pyridine–oxazoline (L8) ligands led to reliable and predictable protocols that provided
A new protocol for the cyclization of N-alkenylamides using chloramine-T and iodine is described. When N-alkenylsulfonamides are treated with chloramine-T and iodine, three- to six-membered N-heterocycles are obtained with complete stereoselectivity. The method is compatible with the cyclization of the allylbenzamide or allylbenzthioamide to afford an oxazoline or thiazoline derivative, respectively. Mechanistic studies indicate that the chloramine-T/I-2 system functions as an effective iodonium species. (c) 2006 Elsevier Ltd. All rights reserved.