Visible light mediated sp(3) C-H bond functionalization of N-aryl-1,2,3,4-tetrahydroisoquinolines via Ugi-type three-component reaction

Organic & Biomolecular Chemistry
Yunyun Chen, Gaofeng Feng

Abstract

An efficient and high yield process for sp(3) C-H bond functionalization of N-aryl-1,2,3,4-tetrahydroisoquinolines is disclosed. This involves a visible light mediated photoredox Ugi-type reaction with carboxylic acids and isonitriles under aerobic conditions, employing Ru(bpy)3Cl2 as a photoredox catalyst and CH3CN as the solvent. CH3CN was found to be crucial for the process, and good to excellent yields were achieved for a wide variety of N-aryl-1,2,3,4-tetrahydroisoquinolines, carboxylic acids, and isonitriles. The developed methodology is attractive for the synthesis of a library of 1,2,3,4-tetrahydroisoquinolines.

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Jan 20, 2016·Organic Letters·Zhengbo Zhu, Daniel Seidel
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