37 STRUCTURES OF DIOSBULBIN-D,-E,-F AND-G,ADDITIONAL FOUR FURANOID-NORDITERPENOIDS FROM DIOSCOREA BULBIFERA L. FORMA SPONTANEA MAKINO ET NEMOTO
Details
In addition to the three furanoid-norditerpenoids, diosbulbin-A (1), -B (2) and-C (3), reported previously, four related compounds, diosbulbin-D (C_<19>H_<20>O_6, mp 226-227°), -E (C_<19>H_<22>O_6, mp 235.5-236.5°), -F (C_<20>H_<24>O_7, mp 201-203.5°) and -G (C_<19>H_<22>O_6, mp 215-216.5°), were isolated from the root tubers of Dioscorea bulbifera L. forma spontanea Makino et Nemoto. On the basis of their chemical and spectral data and correlation of D with others they are assigned the structures 4, 5, 6 and 7, respectively.
