Synthesis of Quinazolines from N-(2-Nitrophenylsulfonyl)iminodiacetate and α-(2-Nitrophenylsulfonyl)amino Ketones via 2H-Indazole 1-Oxides
摘要:
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-nitrobenzenesullonyl chlorides, and bromo ketones/acetates, yielded high purity quinazolines.
Synthesis of Quinazolines from N-(2-Nitrophenylsulfonyl)iminodiacetate and α-(2-Nitrophenylsulfonyl)amino Ketones via 2H-Indazole 1-Oxides
摘要:
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-nitrobenzenesullonyl chlorides, and bromo ketones/acetates, yielded high purity quinazolines.
Multiple contiguous chiralcenters were constructed in one pot using three types of multistep reactions initiated with the Michael addition of N-benzyl-2(R)-methoxy-(+)-10-bornylamide to α,β-unsaturated esters, i.e., asymmetric Michael−aldol reaction, double Michael addition, and double Michael−aldol reaction. The chiral 2-methoxy-10-bornyl group as well as the benzyl group on the amino group of the