Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 19, Issue 41, Pages 8874-8885Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ob01465j
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Funding
- Fundamental Research Funds for the Provincial Universities of Zhejiang [SJLY2021004]
- National Natural Science Foundation of China [21801142]
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Benzimidazo[2,1-a]isoquinolin-6(5H)-one is a structurally unique class of tetracyclic N-heterocycles found in various biologically active natural products, pharmaceutical compounds, and functional materials. The use of N-methacryloyl-2-phenylbenzoimidazoles to construct benzimidazo[2,1-a]isoquinolin-6(5H)-ones through radical strategies has attracted attention due to its versatility and simple preparation of raw materials. This review highlights significant progress in the synthesis of benzimidazo[2,1-a]isoquinolin-6(5H)-ones, focusing on various radical addition-intramolecular cyclization strategies.
Benzimidazo[2,1-a]isoquinolin-6(5H)-one constitutes a structurally unique class of tetracyclic N-heterocycles that are found throughout a myriad of biologically active natural products, pharmaceutical compounds, and functional materials. Various synthetic routes for the preparation of benzimidazo[2,1-a]isoquinolin-6(5H)-ones have been reported. In particular, the use of N-methacryloyl-2-phenylbenzoimidazoles to construct benzimidazo[2,1-a]isoquinolin-6(5H)-ones through various radical strategies have attracted widespread attention due to the versatility and simple preparation of raw materials, as well as the step-economy and mild reaction conditions. Using representative examples, we highlight significant progress in the synthesis of benzimidazo[2,1-a]isoquinolin-6(5H)-ones, including the selection of the catalytic system, substrate scope, mechanistic understanding, and applications. The contents of this review focus on the development of C-, S-, P-, and Si-centered radical addition-intramolecular cyclization strategies.
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