J. Azizian, M. Mehrdad, K. Jadidi
Jul 1, 2000
Citations
0
Influential Citations
20
Citations
Journal
Tetrahedron Letters
Abstract
Reaction of 3-arylimino-2-indolinones 1 with m-chloroperbenzoic acid in CH2Cl2 or methanol at 0°C leads to the corresponding 3-aryl-2,4(1H,3H)-quinazolinediones 4 and (2-arylcarbamoyphenyl)carbamic acid methyl ester 5, respectively. These conversions proceed through 4-arylimino-(1H,4H)-3,1-benzoxazin-2-one 2 and its ring-opened isocyanate carboxamide isomer 3 as key intermediates.