Polycyclic heterocycles with acidic N-H groups IX 1.
The diazosulfonates obtained by diazocoupling of 2-(3-oxo-3,4-dihydroquinoxalin-2-yl)benzenediazonium chloride and its 6,7-dimethyl-derivative 2a,b with sodium sulfite decompose by an unique route in aqueous solution to afford 1-(1H-indazol-3-yl)-1H-benzimidazol-2(3H)-one 4a, and its 5,6-dimethyl-derivative 4b, respectively. The structure of 4a was confirmed by single crystal X-ray analysis
Diazosulfonate rearrangement, 2-(3-oxo-3, 4-dihydroquinoxalin-2-yl)-benzenediazosulfonate
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