FIELD: chemistry.
SUBSTANCE: invention relates to a method for the production of an oxaspirocyclic derivative represented by the formula I, where R1 is hydrogen; R2 is optionally substituted tetrahydronaphthyl or thienyl, a substitute is -OR3; n is equal to 0 or 1; R are such as defined in cl. 1; R3 is C1-6 alkyl. The invention also relates to intermediate compounds (D1), (C) and their production methods.
EFFECT: new method for the production of a compound of the formula (I) with improved yield is developed, which is suitable for industrial large-scale production.
25 cl
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