In the synthesis of five-membered heterocycles by the annulation of epoxides with heterocumulenes such as carbon dioxide and isocyanates, we developed the indium-tin catalytic system and synthesized various cyclic adducts including novel types products under mild reaction conditions.
Processes for preparing 5-acyloxymethyloxazolidin-2-one-derivatives
申请人:KANEGAFUCHI KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0123719A2
公开(公告)日:1984-11-07
A 5-acyloxymethyloxazolidin-2-one derivative having the formula (I):
wherein R1 is an alkyl group; R2 is an alkyl group, an aryl group or an aralkyl group, and a process for preparing the same are disclosed.
The compound (I) is useful as a starting material for preparing drugs.
organocatalyst for the atom‐economic conversion of a plethora of alkyl‐ and aryl‐substituted epoxides and isocyanates into oxazolidinones is described. A mechanism was proposed wherein the nucleophilic ring‐opening operation, and oxo‐ and carbamate‐anions stabilization occur cooperatively towards isocyanate fixation.