Process for asymmetric synthesis of substituted 1,4...

Details Process for asymmetric synthesis of substituted 1,4... Process for asymmetric synthesis of substituted 1,4...

2006-07-11

2006-07-11

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S249000

Reexamination Certificate

active

07074931

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.

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