VISIBLE-LIGHT-DRIVEN, METAL-FREE TETRABUTYLAMMONIUM TRIBROMIDE MEDIATED OXIDATIVE CYCLIZATION OF PHENOLIC AMIDINES TO 2-AMINOBENZOXAZOLES FROM A FACILE RING OPENING OF BENZOXAZOLES AND SECONDARY AMINES
1Babita Yadav
Photophysical and Therapeutic Laboratory, Department of Chemistry, C. M. P. Degree College, University of Allahabad, Prayagraj, UP-211002, India
2Arvind Kumar Yadav
Department of Chemistry, Baba Raghav Das Post Graduate College, Deoria, UP-274001, India,
3Garima
Government Degree College, Gosaikheda, Unnao, UP-209859, India.
4Arvind Kumar Pandey
Department of Chemistry, SPM Govt. Degree College, University of Allahabad, Prayagraj, UP, India
5Santosh K. Srivastava
Photophysical and Therapeutic Laboratory, Department of Chemistry, C. M. P. Degree College, University of Allahabad, Prayagraj, UP-211002, India
6Vishnu Prabhakar Srivastavae
Department of Chemistry, University of Allahabad, Prayagraj, UP-211002, India
Abstract: An efficient synthetic methodology for the photo-oxidative cyclization of the o-phenolic amidines to give 2-aminobenzoxazoles employing tetrabutylammonium tribromide (TBATB), molecular oxygen (O2) and visible light is reported. This oxidative cyclization protocol is executed by catalytic amounts of TBATB, air as the terminal oxidant, and visible-light as driving force to accomplish the product. Developed method is sustainable and high yielding for practical synthesis of desired 2-aminobenzoxazoles.
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Paper Details
Volume11
Issueissue-12
Pages5140-5149
