The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2018
Filed:
Jul. 03, 2014
Applicant:
Dsm Ip Assets B.v., Heerlen, NL;
Inventors:
Jonathan Alan Medlock, Basel, CH;
Ulla Letinois, Basel, CH;
Thomas Netscher, Basel, CH;
Werner Bonrath, Basel, CH;
Assignee:
DSM IP ASSETS B.V., Heerlen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 311/02 (2006.01); C07D 311/22 (2006.01);
U.S. Cl.
CPC ...
C07D 311/22 (2013.01); C07B 2200/09 (2013.01);
Abstract
The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.