P. Phansavath et al., An efficient formal synthesis of (-)-balanol by using ruthenium-catalyzed asymmetric hydrogenation, EUR J ORG C, (23), 2000, pp. 3903-3907
An efficient formal synthesis of (-)-balanol is reported. The ten-step sequ
ence leading to a key precursor 4 features a highly stereoselective synthes
is of the functionalized hexahydroazepine core through dynamic kinetic reso
lution of a racemic alpha -amido beta -keto ester using a ruthenium(II)-cat
alyzed hydrogenation reaction.