A new Furostanoside from Asparagus filicinus

A new furostanoside,aspafiliosde D(1) has been isolated from the root of Asparagus filicinus.Its structure was determined by spectral and chemical methods.     

Synthesis of the aglycon of aspafiliosides E and F via a spiroketal-forming cascade

A facile synthesis 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.