Phosgene-free process for preparing carbamates

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 271/12 (2006.01) C07C 269/04 (2006.01) C07D 241/04 (2006.01) C07D 295/205 (2006.01) C07C 271/22 (2006.01)

Patent

CA 2426466

A phosgene-free method for preparing a carbamate from a compound containing an amine group involves reacting the compound with an alkylating agent in the presence of carbon dioxide and cesium carbonate. A reaction can take place under standard pressure and temperature conditions and produces carbamates in a high yield with low by-product formation.

La présente invention concerne un procédé pour préparer sans phosgène un carbamate, à partir d'un composé contenant un groupe amine. Ce procédé consiste à mettre en réaction le composé avec un agent d'alkylation, en présence de dioxyde de carbone et de carbonate de césium. Cette réaction peut être réalisée dans des conditions de pression et de température normalisées et permet de produire des carbamates avec un haut rendement et avec une faible formation de sous-produits.

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