Facile Preparation of 2-Imino-1,3-selenazolidin-4-one Derivatives by Reaction of <b><i>N</i></b>,<b><i>N’</i></b>-Disubstituted Selenoureas with α-Haloacyl Halides
作者:Mamoru Koketsu、Hideharu Ishihara、Futoshi Nada
DOI:10.1055/s-2002-19800
日期:——
2-Imino-1,3-selenazolidin-4-one derivatives were synthesized by the reaction of N,N'-disubstituted selenoureas with u-haloacyl halides in the presence of pyridine.
1-Selenocarbamoylpiperidine 2 chemoselectively cleaves the O-chloroacetyl group in the presence of other acyl groups such as acetyl, pivaloyl, and Fmoc without the assistance of a base. The high lipophilicity of 2 allowed us to use 1,4-dioxane, THF, and DMF as reaction solvents, thereby enabling dechloroacetylation at high temperature. A comparative experiment with other dechloroacetyl reagents showed that selenourea 2 has a high potential as a dechloroacetylation reagent. (c) 2006 Elsevier Ltd. All rights reserved.