Synthesis of trisubstituted alkenes by Ni-catalyzed hydroalkylation of internal alkynes with cycloketone oxime esters
作者:Xiao-Yu Lu、Chuang-Chuang Liu、Run-Chuang Jiang、Lu-Yu Yan、Qi-Le liu、Qing-Qing Wang、Jia-Mei Li
DOI:10.1039/d0cc06517j
日期:——
Ni-catalyzed hydroalkylation of internal alkynes with cycloketone oxime esters was developed. The reaction has a broad substrate scope. This hydroalkylation shows excellent regio- and stereo-selectivity. This method enables readily available starting materials to be used to access a range of cyano-substituted single-configuration trisubstituted alkenes. These are valuable feedstock chemicals and are widely
described. It is shown that, in most cases, ethyl 3,3-difluorocyclobutanecarboxylate is a convenient common synthetic intermediate to obtain the target derivatives. For preparation of 3,3-difluorocyclobutanol or -cyclobutanone, an alternative pathway via reaction of dichloroketene and tert-butyl or benzyl vinyl ether should be applied. An approach for the multigram synthesis of 3,3-difluorocyclobutyl-substituted
Copper-Catalyzed Coupling Reactions of Cyclobutanone Oxime Esters with Sulfur Nucleophiles at Room Temperature
作者:Mingchuang He、Zhaohua Yan、Fuyuan Zhu、Sen Lin
DOI:10.1021/acs.joc.8b02707
日期:2018.12.21
A copper-catalyzed iminyl radical-mediated C–C bond cleavage/cross-coupling tandem reaction of cyclobutanone oxime esters with aryl thiols in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) at room temperature was developed, and aryl cyanopropyl sulfides were smoothly synthesized in 20–88% yields. By altering the copper reagent and the molar ratio of cyclobutanone oxime ester/aryl thiol/DBU