FIELD: organic chemistry. SUBSTANCE: product - a,5- cyclo -24R- methyl -a- cholest -7,22- diene -6 b-ol, yield is 94%, m. p. is 95-96 C. Reagent 1: ergosterol. Reagent 2: methanesulfochloride. Reaction conditions: in the medium of pyridine following by treatment with sodium hydrocarbonate in aqueous acetone. Product is used for synthesis phytohormone euibrassinolide. EFFECT: accelerated process, excluding of the end product purification.
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