FIELD: organic chemistry, organic synthesis, chemistry of steroids, chemical technology.
SUBSTANCE: invention relates to a method for synthesis of 3β-acetoxy-20-oxonortaraxast-21-ene of the formula (1): 
. Method involves interaction of 3β-acetoxy-2-methylenetaraxastane with ozone excess in chloroform solution at room temperature and stirring followed by reduction of ozonization peroxide substances with Me2S for 24 h at stirring. The process is carried out in the mole ratio 3β-acetoxy-20-methylenetaraxastane : ozone = 1:1.5. The yield of the end product is 93%. Invention provides selective synthesis of compound of the formula (1) with high yield.
EFFECT: improved method of synthesis.
1 ex
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