Diastereoselectivite dans la reaction des organomagnesiens sur le tetrahydrofurfural et son gem-diacetate en presence de HMPT. Acces aux diols-1,2 erythro
one step transformation of esters into secondary alcohols (70--80% yields) has been performed with a Grignardreagent in the presence of calcium or zinc borohydride. Under the same conditions, vinylic Grignardreagents gave γ,δ-unsaturated alcohols in good yields through three successive reactions : addition to the ester carbonyl, then conjugate addition and, finally reduction).