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Intramocular cyclization; Benzoxazins; Benzoxazepins; PPA; Lewis acids

A novel route for the preparation of 2H-1,4- benzoxazin-3(4H)one and 1,5 benzoxazepinones by intramolecular cyclization of N-hydroxy 2-phenoxyacetamide and N-hydroxy -3 phenoxypropanamide using PPA and Lewis acid has been discussed

VISWANATH NAGALINGAM^{1 2} REDDYMASU SREENIVASULU³ NAGARAJAN MADHAVARAO² RAMACHANDRAN DITTAKAVI¹ KRISHNAMURTHY MANNAM⁴

1. Department of Chemistry, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, Andhra Pradesh 522 510, India
2. Bal Pharma Ltd., Bangalore 560 099, Karnataka, India
3. Department of Chemistry, University College of Engineering (Autonomous), Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh 533 003, India
4. Department of Chemistry, SVRM College, Nagaram, Andhra Pradesh 523 268, India

Published

1 August 2020

Manuscript received

24 November 2019

Manuscript revised

4 January 2020

Accepted

6 January 2020