A novel Mitsunobu -based protocol was developed for the synthesis of carbamates from the corresponding alcohols using carbon dioxide and amines in good to excellent yields. This protocol is mild, chemoselective, and efficient compared to other reported methods.
The present invention provides an improved process for the preparation of carbamates with high selectivity of pharmaceutical interest by an eco-friendly, non-toxic, phosgene-/isocyanate-/CO-free clean route through a reaction of amine, organic halide compound and carbon dioxide in the presence of a solid, reusable catalyst at moderate conditions and does not require additional cocatalyst/promoter as well as solvent
METHOD FOR TREATMENT OF ISOCYANATE RESIDUE, AND METHOD FOR TREATMENT OF CARBONATE
申请人:Mitsui Chemicals, Inc.
公开号:EP2518044A1
公开(公告)日:2012-10-31
A method for treating an isocyanate residue, which comprises carrying out a thermal decomposition reaction of a carbamate that is produced by the reaction among an amine, urea and/or an N-unsubstituted carbamic acid ester and an alcohol to produce a decomposition solution, separating an isocyanate and the alcohol from the decomposition solution to produce the isocyanate residue, and bringing the isocyanate residue into contact with high-pressure/high-temperature water to decompose the isocyanate residue into an amine; and a method for treating a carbonate, which comprises bringing the carbonate into contact with high-pressure/high-temperature water to decompose the carbonate into an alcohol.
Mikheev, V. V.; Svetlakov, N. V.; Garipov, R. M., Journal of Organic Chemistry USSR (English Translation), 1982, vol. 18, p. 215 - 220
作者:Mikheev, V. V.、Svetlakov, N. V.、Garipov, R. M.
DOI:——
日期:——
Triton-B Catalyzed, Efficient, One-Pot Synthesis of Carbamate Esters from Alcoholic Tosylates
作者:Devdutt Chaturvedi、Suprabhat Ray
DOI:10.1007/s00706-005-0452-2
日期:2006.4
A novel process for the one-step chemoselective conversion of a variety of alcoholic tosylates into carbamates serving as protected an-fines was developed using benzyltrimethylammonium hydroxide (Triton-B) in the presence of gaseous carbon dioxide. Thus carbamate esters of different amines were prepared in very good to excellent yields.