Nickel-Mediated Asymmetric Allylic Alkylation between Nitroallylic Acetates and Acyl Imidazoles
作者:Jie Wang、Pengxin Wang、Linqing Wang、Dan Li、Kezhou Wang、Yuan Wang、Haiyong Zhu、Dongxu Yang、Rui Wang
DOI:10.1021/acs.orglett.7b02264
日期:2017.9.15
A nickel-mediated asymmetric allylic alkylation reaction between imidazole-modified ketones and nitroallylic acetates is presented. This reaction is catalyzed by a simple chiral diamine-nickel catalyst under mild conditions and leads to a series of novel enantioenriched α-allylic adducts in moderate to good yields with excellent enantioselectivities. Furthermore, transformation of the allylic adducts
Stereocontrolled Construction of Spirooxindole-Containing 5,6,7,8-Tetrahydropyrrolo[1,2-<i>a</i>]pyridine via Michael/Friedel–Crafts Domino Reaction Promoted by Secondary Amine-Squaramide
作者:Pengxuan Yin、Zijie Zhou、Lingsheng Shi、Chengzhi Xiang、Ling Ye、Min Han、Zhichuan Shi、Zhigang Zhao、Xuefeng Li
DOI:10.1021/acs.orglett.4c00073
日期:2024.3.22
An asymmetric Michael/Friedel–Crafts cascadereaction with Morita–Baylis–Hillman (MBH) nitroallylic esters and 3-pyrrolyloxindoles has been developed for the stereoselective construction of spirooxindole-containing tetrahydroindolizines. A range of tetracyclic scaffolds possessing three consecutive chiralcenters, including an all-carbonquaternary stereocenter, were generated in 53–85% isolated yields