The direct synthesis of N-phenylcarbamates from CO2, aniline, and dibutyltin dialkoxide

The first successful example of a halogen -free process for producing N-phenylcarbamate from CO2 and aniline without toxic or corrosive phosgene is reported here. Aniline was reacted with nBu(2)Sn(OMe)(2) (1) in the presence of carbon dioxide (5 MPa) to give the corresponding methyl N-phenylcarbamate in a yield of 80% within 20 min. (C) 2016 Elsevier Ltd. All rights reserved.