Stereochemistry of the reductoisomerase and αβ-dihydroxyacid dehydratase-catalysed steps in valine and isoleucine biosynthesis. Observation of a novel tertiary ketol rearrangement
Abstract
The reductoisomerase of Salmonella typhimurium has a requirement for the 2S-isomer of acetolactate (III, R = Me) while the αβ-dihydroxy-acid dehydratase has a requirement for the 2R configuration but is not stereoselective with respect to the configuration at C-3.