FIELD: chemistry.
SUBSTANCE: invention relates to a method for regiospecific synthesis of rapamycin 42-ester derivatives of formula 
, where R is ketal isopropylidene substituted with 3-hydroxy-2-(hydroxymethyl)-2-methylpropionic acid, linear or branched C1-C10 alkyl, which possibly contains a halogen, C2-C8 alkenyl, or phenyl, where the said method involves acylation of 42-hydroxyrapamycin with an acyl donor in the presence of lipase. The invention also relates to regiospecific preparation of rapamycin 42-ester from ketal isopropylidene substituted with 3-hydroxy-2-(hydroxymethyl)-2-methylpropionic acid in the presence of lipase.
EFFECT: increased output of the product under mild conditions.
13 cl, 12 ex
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