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:
Jul. 11, 2006
Filed:
Jul. 31, 2001
Ian Patel, Bristol, GB;
Ian Ashworth, Stalybridge, GB;
Daniel Levin, Poynton, GB;
Astrazeneca AB, Sodertalje, SE;
Abstract
A process is described for reacting a vinylogous amide with an α,β-unsaturated ketone in the presence of a silicon compound to form an 1,5-diketone which is converted to a 1,4-dihydropyridine. Asymmetric substituted 1,4-dihydropyridines are synthesized by the process by preparing an asymmetric vinylogous amide by reacting a 1,3-cyclohexanedione with a substantially homo-chiral phenylethylamine. Reaction of the asymmetric vinylogous amide with an α,β-unsaturated ketone in the presence of a silicon compound forms an asymmetric 1,5-diketone. The 1,5-diketone is converted to an asymmetric substituted 1,4-dihydropyridine.