Further Syntheses of Optically Active Verrucarinic Acid, 43rd Communication of Verrucarins and Roridins

Abstract
Two new syntheses of verrucarinic acid (2S, 3R‐dihydroxy‐3‐methylpentanoic acid) and its derivatives, suitably protected for the further conversion to macrocyclic trichothecenes, are described. The first one makes use of a diastereoselective alkylation of a (−)‐(S)‐malic acid ester and the regioselective reductin of one carboxyl function toa methyl group. The second approach involves a stereoselective addition of an allylsilane to a chiral glyoxylate.