FIELD: organic synthesis. SUBSTANCE: method of preparing epoxide with formula I: 
(I) includes following steps: (i) interaction of 1 equivalent of compound with formula II: 
(II) with 1-2 equivalents of halogenation agent at temperature from -40 to -100 C in solvent mixed with aqueous solution of weak base and (ii) cyclization halohydrin with formula III: 
(III) prepared in step (i) by adding base in solvent. Compound I is a new intermediate utilized in synthesis of human HIV protease inhibitors. EFFECT: extended range of compounds useful in synthesis of anti-aids preparations. 6 cl, 11 ex
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