Formation and dehydration of a prochiral 2-hydroxyisopropyl centre during biosynthesis: the rot-2′-enonic acid–rotenone transformation in Amorpha fruticosa
Abstract
Rot-2′-enonic acid (2), dalpanol (4), and rotenone (5) are formed during the conversion of 9-demethylmunduserone (1) into amorphigenin (6) by Amorpha fruticosa seedlings: the 4′-E-methyl of (2) becomes predominantly the 7′-methylene of (5), leading to stereochemical proposals for a formation scheme.