METHOD OF PREPARING PHOTOSTABUILIZATOR WITH STERICALLY DIFFICULT AMINE Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: reaction is carried out using alkyl-substituted 4-hydroxypiperidine of the formula (I) -N-C(R′CH₂)(CH₃-CH-CH(OH)-CH-C(CH₃)(CH₂R′), where R′ - hydrogen or methyl and dicarboxylic acid ester of the formula (II) R″-O-C(O)-(CH₂)_n-C(O)-OR′′′, where R″ and R′′′ - linear or branched (C₁-C₁₂)-alkyl, (C₅-C₁₂)-cycloalkyl, (C₆-C₁₂)-aryl or (C₇-C₁₂)-alkaryl, or arylalkyl that can be similar or different; n - whole number 1-12. Reaction is performed in the medium of polar aprotonic organic compound taken from the group involving N-methylpyrrolidinone, 1,2-dimethoxybenzene, N,N-dimethylacetamide, hexamethyltrophosphoroamide, dimethylaminopyridine, tetramethylsulfone, tetraethylene glycol dimethyl ester, ethylene glycol dimethyl ester, N,N, N′,N′-tetramethylethylenediamine, 1,3-dimethyl-2-imidazolidinone, dimethylsulfoxide, 12-crown-4 taken at concentration 5-12 wt.-% of total reagent quantity, at 80-165 C, at molar ratio of compound of the formula (I) and compound of the formula (II) (2: 1)-(3.2:1). EFFECT: improved method of synthesis. 15 cl