Synthesis of ribosylhopane, the putative biosynthetic precursor of bacterial triterpenoids of the hopane series
作者:Tore Duvold、Michel Rohmer
DOI:10.1016/s0040-4020(99)00567-0
日期:1999.8
A versatile, efficient route to ribosylhopane with control over all asymmetric carbon atoms of the side-chain is presented. The synthesis is based on two chain elongations starting from diploptene by subsequent additions of two acetylenic moieties. In a key step a keto-propiolate is stereoselectively reduced to the corresponding hydroxy-propiolate by means of a chiral oxazaborolidine assisted hydroboration