FIELD: organic chemistry, pharmaceuticals.
SUBSTANCE: invention relates to improved method for production of 4,17(20)-E-pregnadiene-3,16-dione (E-guggulsterone) of formula III 
and 4,17(20)-Z-pregnadiene-3,16-dione (Z-guggulsterone) of formula IV 
including oxidation of compound of formula II 
, wherein C-OH or =O; ----- is optional double bond with pyridinium chlorochromate, pyridinium dichromate etc to produce 4,17(20)-E-pregnadiene-3,16-dione of formula III followed by conversion thereof by photochemical, thermochemical reaction or reaction in presence of acidic catalyst. Compounds of formulae III and IV effectively decrease increased low density lipoprotein levels and high cholesterol levels.
EFFECT: improved method for production of 4,17(20)-Z-pregnadiene-3,16-dione.
8 cl, 46 ex, 9 dwg
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