Patent ID: 6300512
Filing Date: 2001-10-09
Classification: C07C

Abstract:
Process for production of a 1-(3-cyclopentyloxy-4-alkoxyphenyl)-4-oxocyclohexanecarbonitrile of the general formula ##STR12##wherein R.sup.1 signifies a C.sub.1-5 -alkyl group, comprising the cyclization of a 4-cyano-4-(3-cyclopentyloxy-4-methoxyphenyl)heptanediacid dialkyl ester of the general formula ##STR13##wherein R.sup.1 has the given meaning and R.sup.2 and R.sup.3 signify C.sub.1-5 -alkyl groups, in the presence of a base, to a 5-cyano-5-(3-cyclopentyloxy-4-alkoxyphenyl)-2-oxocyclohexanecarboxylic acid alkyl ester of the general formula ##STR14##wherein R.sup.1 and R.sup.2 have the given meanings, neutralization of the compound to the general formula III with an alkali metal hydrogen carbonate and then decarboxylation, in the presence of an alkali metal carbonate, to the end product as per formula I.