2,6-Dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid esters an

Details 2,6-Dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid esters an 2,6-Dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid esters an

1980-04-03

1981-10-06

Randolph, John D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

424263, C07D21380, C07D21190

Patent

active

042937000

ABSTRACT:
2,6-Dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid esters of the general formula: ##STR1## wherein R is a substituted alkyl or terpenyl. A method for preparing said esters comprises reacting esters of acetoacetic acid of the general formula: CH.sub.3 COCH.sub.2 COOR, wherein R is a substituted alkyl or terpenyl, with hexamethylenetetramine in the presence of ammonium acetate in ethanol at its boiling temperature; said esters of acetoacetic acid of the above general formula, hexamethylenetetramine and ammonium acetate can be used in stoichiometric proportions.

REFERENCES:
patent: 4214088 (1980-07-01), Abeler et al.
patent: 4239893 (1980-12-01), Pigerol et al.

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