Cascade cyclization of glycine derivatives with β-ketoesters for polysubstituted 1,4-dihydropyridines by visible light photoredox catalysis
作者:Xiao Zhu、Zhi-Qiang Zhu、Dong Guo、Shan Liu、Jiu-Jian Ji、Juan Tang、En Yuan、Zong-Bo Xie、Zhang-Gao Le
DOI:10.1016/j.tet.2020.131353
日期:2020.8
Visiblelight photocatalytic cascade cyclization reaction between glycine derivatives and β-ketoesters using Ir (ppy)3 as a catalyst and dicumyl peroxide (DCP) as an oxidant was described. A series of N-aryl glycine esters proceeded the cyclization smoothly with β-ketoesters at room temperature, affording the desired 1,4-dihydropyridines (1,4-DHPs) in satisfactory yields. A possible mechanism for the
Synthesis of New 1, 4-Dihydropyridines by Addition-Rearrangement Process with Imine Derivatives and β-Ketoester as Starting Materials in Solvent-Free Conditions (SUPPORTING INFORMATION)
作者:Xueming Chen、Xiaoguang Huang、Yunyun Chen、Feng He、Xingshu Li
DOI:10.2174/157017809787893082
日期:2009.4.1
N-substituted 1,4-dihydropyridines bearing a carboxyl group at the 4-position were synthesized in solvent-free conditions with Cu2+ as the catalyst, imine and β-ketoester as starting materials. The possible mechanism which consists of addition-rearrangement process was proposed and examined by the reaction of isolated product of first addition to β- ketoester.