126556-33-0

Upstream product

• 34315-03-2 3-(2-Aminophenyl)sydnone 
• 126556-31-8 4-bromo-3-(2-azidophenyl)sydnone 

Downstream Products

• 161464-95-5 triphenylphosphine 2-(3-sydnonyl)phenylimide 
• 137129-54-5 4-(<4-nitrophenyl>amino)sydno<3,4-a>quinoxaline 
• 137129-53-4 4-(<4-anisyl>amino)sydno<3,4-a>quinoxaline 
• 137129-55-6 4-(<4-chlorophenyl>amino)sydno<3,4-a>quinoxaline 
• 137129-52-3 4-(<4-tolyl>amino)sydno<3,4-a>quinoxaline 
• 137129-51-2 4-(phenylamino)sydno<3,4-a>quinoxaline 
• 126556-31-8 4-bromo-3-(2-azidophenyl)sydnone 
• 95-14-7 1,2,3-Benzotriazole 

Relevant academic research and scientific papers

Intramolecular aza-Wittig routes to sydnoquinoxalines

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.

DEBROMINATION OF 4-BROMO-3-ARYLSYDNONES WITH SODIUM SULFITE

4-Bromo-3-arylsydnones 1 are debrominated to the corresponding 3-arylsydnones 2 in good to excellent yield using sodium sulfite in methanol/water.In contrast to previously employed reagents, the reaction is successful in the presence of electron-donating,