Studies on the Constituents of the Root of Cayaponia tayuya (VELL.) COGN. II. Structures of Cayaponosides, New 29-Nor-2, 11-dioxocucurbita-3, 5-diene Glucosides

Abstract

The bitter constituents in the root of Cayaponia tayuya (VELL.) COGN. were investigated, and 24 29-norcucurbitacin glucosides, named cayaponosides, were isolated. Among the 24 29-norcucurbitacin glucosides, named cayaponosides, isolated from the root of Cayaponia tayuya (VELL.) COGN., structures of cayaponosides A₁, B_6a, B_6b, C₃ D_3a and C_3b were determined based mainly on spectral analyses. They are all 3-O-glucosides of 29-nor-2, 11-dioxocucurbita-3, 5-diene, only different in side chain structure.