FIELD: organic chemistry. SUBSTANCE: product: azetidine derivative of the formula (I) 
with definite radical values. Reagent 1: compound of the formula (I) where R3-H. Reagent 2: compound of the formula R3-X, where R3 as indicated above, X halogen atom. Reaction conditions: conversion of the group R3 if necessary to any other meaning of the group R3. Synthesized compounds were used as antiallergic and antiasthmatic drugs. EFFECT: improved method of synthesis. 2 tbl
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