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
Complex Biohopanoids Synthesis: Efficient Anchoring of Ribosyl Subunits onto a C30 Hopane
作者:Weidong Pan、Chao Sun、Yongmin Zhang、Guangyi Liang、Pierre Sinaÿ、Stéphane P. Vincent
DOI:10.1002/chem.200600659
日期:2007.2.2
through a C--C bond. The biological function of biohopanoids also has to be addressed when one considers the broad diversity in both structures and functionalities found in the side chain. Moreover, the stereochemistries of some biohopanoids are still unconfirmed, due to the lack of synthetic methods to prepare them. In this study we describe an efficient methodology for the formation of the C--C bond