Process for preparing cyclic esters and cyclic amides

US9573924B2 · kind B2 · utility

Assignee

• TOTAL RESEARCH & TECHNOLOGY FELUY · BE

Inventors

• Bert Sels · Balen, BE
• Michiel J. Dusselier · Kessel-Lo, BE

Key dates

• Filing date: Feb 7, 2014
• Grant date: Feb 21, 2017
• Expiry date: Feb 7, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D313/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing a cyclic ester or a cyclic amide includes contacting hydroxycarboxylic acid and/or amino-carboxylic acid, an ester thereof, or a salt thereof, with acidic zeolite. The hydroxycarboxylic acid is a 2- or 6-hydroxycarboxylic acid, and the amino carboxylic acid is a 2- or 6-amino-carboxylic acid. The zeolite may include two or three interconnected and non-parallel channel systems, in which a channel system includes 10- or more-membered ring channels, and in which a framework Si/X2 ratio is at least 24 as measured by NMR. X is Al or B. The zeolite may include three interconnected and non-parallel channel systems, in which at least two channel systems include 10- or more-membered ring channels, and in which a framework Si/X2 ratio is at least 6 as measured by NMR. The process may be performed at a pressure between 0.5 and 20 bar.