1,4‐Benzoxazin‐2‐ones, benzo[<i>d</i>]oxazoles and 2<i>H</i>‐1,4‐benzoxazines from the reaction of 2‐(methoxyimino)benzen‐1‐ones with arylacetates, arylacetic acids and <i>trans‐</i> stilbene

Abstract

Abstract 10‐(Methoxyimino)phenanthrene‐9‐one 1 reacts thermally with the arylacetic derivatives 2(a‐j ) to yield the corresponding 1,4‐benzoxazin‐2‐ones 4(a‐d,f ) and benzo[ d ]oxazoles 5(a‐e,g ). Similarly, reaction of the monoximes 7a, 7b with compounds 2a, 2d respectively affords 8a, 8b , while action of trans ‐stilbene on the monoximes 1, 7a, 7b leads to the 1,4‐benzoxazines 10, 11, 13 , obtained along with the corresponding 2‐phenyloxazoles 5a, 8a, 8c and compound 12 .