DK410184A - PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS - Google Patents

PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS Download PDF

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Publication number
DK410184A
DK410184A DK410184A DK410184A DK410184A DK 410184 A DK410184 A DK 410184A DK 410184 A DK410184 A DK 410184A DK 410184 A DK410184 A DK 410184A DK 410184 A DK410184 A DK 410184A
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formula
image
group
denotes
optionally substituted
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DK410184A
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Danish (da)
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DK161701C (en
DK161701B (en
DK410184D0 (en
Inventor
Werner Teller
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Bayer Ag
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Priority to DK410184A priority Critical patent/DK161701C/en
Publication of DK410184D0 publication Critical patent/DK410184D0/en
Publication of DK410184A publication Critical patent/DK410184A/en
Publication of DK161701B publication Critical patent/DK161701B/en
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Publication of DK161701C publication Critical patent/DK161701C/en

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Abstract

Asymmetric 1,4-dihydropyridinedicarboxylic acid esters of the formula <IMAGE> where R denotes a phenyl group which is optionally substituted once or twice by nitro and/or chloro, R1 denotes a C1-C4-alkyl group which is optionally substituted by a C1-C4-alkoxy group, and R2 denotes a C1- C12-alkyl group which is optionally substituted by a C1- C4-alkoxy group, a trifluoromethyl group or the group [C6H5CH2][CH3]N, with the groups R1 and R2 not being identical, are prepared by reacting an ylidene compound of the formula II or III <IMAGE> with an enamine compound of the formula IV or V <IMAGE> with the ylidene compound of the formula II or III being prepared by reacting a ketocarboxylic acid ester of the formula VI or VII <IMAGE> with an aldehyde of the formula RCHO in a solvent in the presence of catalytic quantities of acetate salts of amines at temperatures of from -10 degree C to 100 degree C. The yield in this process is higher than in the known methods, and it is not necessary to subject the isolated end product to any further purification step.
DK410184A 1984-08-28 1984-08-28 PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS DK161701C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK410184A DK161701C (en) 1984-08-28 1984-08-28 PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK410184A DK161701C (en) 1984-08-28 1984-08-28 PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS
DK410184 1984-08-28

Publications (4)

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DK410184D0 DK410184D0 (en) 1984-08-28
DK410184A true DK410184A (en) 1986-03-01
DK161701B DK161701B (en) 1991-08-05
DK161701C DK161701C (en) 1992-01-27

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DK410184A DK161701C (en) 1984-08-28 1984-08-28 PROCEDURE FOR THE PREPARATION OF UNYMMETRIC 1,4-DIHYDROPYRIDE INDICARBOXYLIC ACID ESTERS

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DK161701C (en) 1992-01-27
DK161701B (en) 1991-08-05
DK410184D0 (en) 1984-08-28

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