Carbene-catalyzed LUMO activation of alkyne esters for access to functional pyridines
作者:Chengli Mou、Jichang Wu、Zhijian Huang、Jun Sun、Zhichao Jin、Yonggui Robin Chi
DOI:10.1039/c7cc08039e
日期:——
A carbene-catalyzed LUMOactivation of α,β-unsaturated alkyne esters is reported. This catalytic process allows for effective reactions of alkyne esters with enamides to synthesize functional pyridines via simple protocols. A previously unexplored unsaturated alkyne acyl azolium intermediate is involved in the key step of the reaction.
The enantioselective aza-Friedel–Crafts reaction of indoles with low-reactive ketimines has been developed in the presence of a chiral monopotassium binaphthyldisulfonate as a strong Brønsted acid catalyst. A broad substrate scope was achieved, and the corresponding 3-indolylmethanamines with a chiral quaternary carbon center were obtained in high yields with high enantioselectivities. The addition
Direct Activation of β-sp<sup>3</sup>-Carbons of Saturated Carboxylic Esters as Electrophilic Carbons via Oxidative Carbene Catalysis
作者:Bin Liu、Weihong Wang、Ruoyan Huang、Jiekuan Yan、Jichang Wu、Wei Xue、Song Yang、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b03650
日期:2018.1.5
An N-heterocyclic carbene-catalyzed oxidative LUMO activation of the β-cabons of saturated carboxylic esters is disclosed. This approach allows for efficient asymmetric access to lactams and lactones by directly installing functional groups to the typically inert β-sp3 carbons of saturated esters. The use of HOBt as an additive was found to significantly improve both yields and enantioselectivities
N-Heterocyclic carbene catalyzed C-acylation reaction for access to linear aminoenones
作者:Jie Lv、Yingling Nong、Kai Chen、Qingyun Wang、Jiamiao Jin、Tingting Li、Zhichao Jin、Yonggui Robin Chi
DOI:10.1016/j.cclet.2022.05.084
日期:2023.1
An N-heterocycliccarbene (NHC)-catalyzed carbonyl nucleophilic substitution reaction between 1-cyclopropylcarbaldehydes and N-sulfonyl imines is developed for access to linear β-aminoenone products. The β-aminoenones containing cyclopropyl fragments can be afforded in moderate to excellent yields under mild conditions. The reaction features excellent trans-diastereoselectivities and the desired aminoenone