137129-53-4Relevant academic research and scientific papers
Intramolecular aza-Wittig routes to sydnoquinoxalines
Burson III,Jones,Turnbull,Preston
, p. 745 - 746 (2007/10/02)
3-(2-Azidophenyl)sydnone (5) were prepared directly from amine 3 by a novel process involving diazotization in the presence of azide ion. Reaction of the triphenylphosphine imide 7, derived from 5, with isocyanates or isothiocyanates gave the 4-aminosydno[3,4-a]quinoxalines 9 in moderate to good yield, presumably via aza-Wittig conversion to carbodiimide intermediates 8 and subsequent electrophilic aromatic substitution at the sydnone ring 4-position.
