Process for preparing the compound of formula (I) (See formula) in which: Ar represents an aryl radical, R represents a hydrogen atom or an acetyl, alkoxyacetyl or alkyl radical, R1 represents a benzoyl radical or an R2-O radical -CO- in which R2 represents a linear or branched alkyl radical containing from 1 to 8 carbon atoms. by a procedure that consists in contacting the compound of formula (II) (See formula) in which R '' is a protective group of the hydroxyl function when in formula (I) R represents hydrogen or one of the groups mentioned for R with a weak base chosen among the molecular sieves, then successively or previously condense a precursor of the side chain and finally protect the optionally protected hydroxyl functions, characterized in that the cyclopropaneation reaction takes place in the sulfolane.
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