Process for the preparation of carbamates

Details Process for the preparation of carbamates Process for the preparation of carbamates

2006-05-22

2008-07-29

Eyler, Yvonne (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S160000, C560S157000

Reexamination Certificate

active

07405319

ABSTRACT:
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.

REFERENCES:
Srivastava, R. et al., “Phosgene-free synthesis of carbamates over zeolite-based catalyst”, Aug. 2004, Catalysis Letters, vol. 97, No. 1-2, pp. 41-47.
Srivastava, R. et al., “Syntheses of polycarbonate and polyurethane precursors utilizing CO2 over highly efficient solid as-synthesized MCM-41 catalyst”, May 9, 2006, Tetrahedron Letters, vol. 47 pp. 4213-4217.

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