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Paper | Regular issue | Vol 38, No. 9, 1994, pp.2023-2026
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6781
Synthesis of Sydnoquinoxalines and Bis(sydnonylphenyl)urea

Wing Lai Chan,* James A. Waite, Yuan Hua Lin, and Yan Shan Szeto

*Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic, Hung Hom, Kowloon, Hong Kong

Abstract

Sydno[3,4-a]quinoxalin-4-one (2) and -4-thione (3) were prepared directly from 3-(o-aminophenyl)sydnone (1) with phenyl isocyanate, 1,1‘-carbonyl diimidiazol (CoIm2) and phenyl isothiocyanate respectively in good yield. N,N‘-Bis[o-(3-sydnonyl)phenyl]urea (4) was also obtained under slightly different conditions between 1 and CoIm2.