The metalation of oxazoles leads to ring opening to the isocyanoenolate that can be O-acylated to give the unsaturated isonitriles. These substances undergo conventional multicomponent reactions. The products of their reactions are readily converted to acyl substitution products by treatment with acid and a nucleophile. These unsaturated isonitriles are notable by their simple preparations and, unusually, their nonoffensive odors.
Synthesis of 2,5-Diketopiperazine Derivatives Using 2-Isocyanophenyl 4-Methylbenzoate as a Fragrant Convertible Isocyanide
作者:Fei Ji、Wen-Bin Yi、Chun Cai
DOI:10.1002/jhet.1684
日期:2014.9
new protocol in which 2‐isocyanophenyl 4‐methylbenzoate is used as a convertibleisocyanide for Ugi/deprotection + activation/cyclization synthesis of 2,5‐diketopiperazine derivatives has been developed. This operational simple procedure displays good functional group tolerance and avoids treatment of typically known offensive isocyanides.