Visible-light-promoted aerobic oxidative cyclization to access 1, 3, 4-oxadiazoles from aldehydes and acylhydrazides
AK Yadav, LDS Yadav
Index: Yadav, Arvind K.; Yadav, Lal Dhar S. Tetrahedron Letters, 2014 , vol. 55, # 13 p. 2065 - 2069
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Citation Number: 16
Abstract
Abstract A novel and practical access to symmetrical and unsymmetrical 2, 5-disubstituted 1, 3, 4-oxadiazoles directly from aldehydes and acylhydrazides using visible light irradiation under an air atmosphere in the presence of eosin Y as an organophotoredox catalyst at rt is reported. This is the first example of oxidative cyclization of acylhydrazones employing air and visible light as inexpensive, readily available, non-toxic, and sustainable reagents.
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