Synthesis of the aglycon of aspafiliosides E and F via a spiroketal-forming cascade
作者:Jing-Jing Wu、Yong Shi、Wei-Sheng Tian
DOI:10.1016/j.tetlet.2017.01.067
日期:2017.3
A facilesynthesis of C17α-OH-tigogenin, the aglycon of aspafiliosides E and F, is described. The crucial step is the spiroketal-forming cascade, which forms the rings EF in one step and provides a new strategy for spiroketal ring closure in steroidal sapogenins and other substrates. This synthesis minimizes redundant oxidation-reduction manipulations of previous syntheses.