Patent ID: 8492590

Claim:
A process for the preparation of a compound of formula (4), in which R1=C1-C6 alkyl, substituted alkyl, aryl or substituted aryl; R2=H, C1-C6 alkyl or substituted alkyl; R3=CO—R1 or —CO—X, where X=OR1, SR1, NR2R2′, where R2′ is defined like R2 and may be identical to or different from R2; R2 and R2′ can form a ring; SO(n′)-R1, where n′=may be 0, 1 or 2; —CN; —NO 2 , aryl or heteroaryl; R4=F, Cl, Br, I, CF 3 , CN, NO 2 , or COX; where X=OR1, SR1, or NR2R2′, where X=OR1, SR1, NR2R2′, where R2′ is defined like R2 above and may be identical to or different from R2, n=1-4, R5=H, C1-C6 alkyl or substituted alkyl, which comprises reacting a mixture of an aniline (compound of formula Q): in which the radicals R4, n and R5 are as defined in formula (4), with a thioether (compound of formula W): in which the radicals R1, R2 and R3 are as defined in formula (4), in the presence of a chlorinating agent and an organic solvent at a reaction temperature in the range between −60 and −10° C., wherein the addition of an additional tertiary amine is dispensed with, to give the compound of formula (4).