Synthesis of Quinazolines from N-(2-Nitrophenylsulfonyl)iminodiacetate and α-(2-Nitrophenylsulfonyl)amino Ketones via 2H-Indazole 1-Oxides

Base-catalyzed rearrangement of 2H-indazoles 1-oxides, prepared by tandem carbon−carbon followed by nitrogen−nitrogen bond formations from easily accessible N-alkyl-2-nitro-N-(2-oxo-2-aryl-ethyl)-benzenesulfonamides using glycine, 2-nitrobenzenesulfonyl chlorides, and bromo ketones/acetates, yielded high purity quinazolines.