Ring contraction of 1,2,4-benzoxadiazines to benzoxazoles
作者:Thomas L. Gilchrist、C. John Harris、Michael E. Peek、Charles W. Rees
DOI:10.1039/c39750000962
日期:——
1,2,4-Benzoxadiazines (1) are converted into the corresponding benzoxazoles (2) in good yields by heating in solvents at 80–140 °C; a mechanism involving π4a+π2a cyclisation of an ortho-quinoneimine intermediate is suggested.