CuBr-promoted domino Biginelli reaction for the diastereoselective synthesis of bridged polyheterocycles:Mechanism studies and in vitro anti-tumor activities  

作　　者：Mengting Zeng Ying Xue Yunan Qin Fen Peng Quan Li Ming-Hua Zeng 

机构地区：[1]Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials,Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules,College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China [2]Sichuan Center for Disease Control and Prevention,Chengdu 610041,China [3]Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources,School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin 541004,China

出　　处：《Chinese Chemical Letters》2022年第11期4891-4895,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21901067,22171075);Starting Grant from the Ministry of Human Resource and Social Security of China(Q.L.);the NSFC of Guangxi Province(Nos.91122032,2017GXNSFDA198040);the BAGUI talent program(No.2019AC26001)。

摘　　要：The low-cost CuBr-promoted domino Biginelli reaction among readily available ketones,salicylaldehyde derivatives and 3-amino-1,2,4-triazole was studied under solvothermal conditions,giving the novel bridged polyheterocycles bearing two or three stereocenters depending on the starting ketones.This multicomponent reaction proceeded with high diastereoselectivity(dr>20:1)based on a combined~1 H NMR,crystallographic and supercritical fluid chromatographic(SFC)analysis of the product.Time-dependent high-resolution mass spectrometry(HRMS)was performed to track the reaction process,and several key intermediates were identified,leading to the drawing of a plausible reaction mechanism.Density functional theory(DFT)calculation was supplemented,and two reaction pathways were differentiated.Moreover,in vitro antitumor activity was evaluated using HeLa and HepG2 cell lines,and two of these polyheterocycles demonstrated promising activities against HepG2 cells with EC50 down to 10μmol/L.Additionally,ESI-MS/MS studies on all the polyheterocycles suggest a common fragmentation pathway(loss of one molecule of amino-triazole)they shared,providing the first-hand fragmentation rules for future rapid structural identification of them.The multicomponent domino reaction presented here may offer prospects for future design of more efficient strategies to access medicinally important bridged polyheterocycles.

关 键 词：Multicomponent reaction Domino reaction Biginelli reaction Bridged polyheterocycles Reaction mechanism Anti-tumor activities 

分 类 号：O621.25[理学—有机化学] TQ460.1[理学—化学]