Iminophosphorane-mediated synthesis of 2H-indazole derivatives: preparation of 2,3-diamino-2H-indazoles by intramolecular trapping of phosphazides and 1H-1,2,4-triazolo[2,3-b]indazoles by a tandem aza-Wittig/heterocumulene-mediated strategy
Intramolecular trapping of a phosphazide by an imine: Formation of 2,3-diamino-2H-indazole derivatives from o-azidobenzaldimines and tertiary phosphines
作者:Pedro Molina、Antonio Arques、María Victoria Vinader
DOI:10.1016/s0040-4039(01)93353-2
日期:——
Treatment of o-azidobenzaldimines with tertiaryphosphines in dichloromethane at 0°C gave the corresponding 2,3-diamino-2H-indazole derivatives in good yields via the Staudinger reaction followed by cyclization of the intermediate phosphazide.