Patent ID: 8309732

Claim:
Process for preparing compounds of the general formula (I) in which R 1 is a C 3 -C 20 -cycloalyl radical, R 2 is a C 1 -C 20 -alkyl radical, and R 3 is a C 1 -C 20 -alkyl radical or C 3 -C 20 -cycloalkyl radical, wherein compounds of the general formula (II) in which R 1 and R 2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R 3 X (III), in which X represents a halogen atom and R 3 has the meaning given for formula (I), and wherein the alkylating agent is initially charged in dichloromethane as the solvent and the compound of formula (II) is, if appropriate, is metered into the reaction.