Chen J, Li Z, Suleman M, Wang Z, Lu P, Wang Y. TfOH-promoted synthesis of 4,5-dihydrooxazolo[5,4-
c]isoquinolines
via formal [3 + 2] cycloaddition of 4-diazoisoquinolin-3-one and benzonitriles.
Org Biomol Chem 2020;
18:7671-7676. [PMID:
32966526 DOI:
10.1039/d0ob01748e]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A facile and efficient method for the synthesis of novel 2-substituted 4-tosyl-4,5-dihydrooxazolo[5,4-c]isoquinolines from 4-diazoisoquinolin-3-ones and nitriles is reported. The reaction proceeded through a TfOH-promoted formal [3 + 2] cycloaddition and the products could be conveniently converted to 2-aryloxazolo[5,4-c]isoquinolines and the subsequent 2-(oxazolo[5,4-c]isoquinolin-2-yl)phenol which emitted bright green light in dilute dichloromethane solution and in solid form as well. Simple operation, metal-free and mild reaction conditions, short reaction time and broad substrate scope are the prominent features of this methodology.
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