Neutral triterpenes from the galls of Pistacia terebinthus
作者:P. Monaco、R. Caputo、G. Palumbo、L. Mangoni
DOI:10.1016/0031-9422(73)80709-5
日期:1973.4
Delprino, Laura; Caputo, Otto; Balliano, Gianni, Journal of Chemical Research, Miniprint, 1984, # 8, p. 2301 - 2326
作者:Delprino, Laura、Caputo, Otto、Balliano, Gianni、Berta, Stefano、Bouvier, Pierrette、Cattel, Luigi
DOI:——
日期:——
Higher isoprenoids—I
作者:A.S. Gupta、Sukh Dev
DOI:10.1016/s0040-4020(01)92478-0
日期:1971.1
Syntheses of betulafolienetriol and the Ginseng sapogenin, 20(S)-protopanaxadiol.
作者:RYOJI KASAI、KEIKO SHINZO、OSAMU TANAKA
DOI:10.1248/cpb.24.400
日期:——
In an attempt toward the synthesis of 20 (S)-protopanaxadiol (I) from dammarenediol-II (V), the introduction of a hydroxy function to C-12 of the dammarane skeletone has been studied. A solution of p-nitrobenzoate (IX) of 3-epi-dammaranediol-I (VIII) in tert-BuOH was irradiated for 40 hr and the products were saponified to give 17-octakis-nordammarane-3α, 17β-diol (X). From the crude irradiation products, 6-methyl-2-heptanone (XII) was isolated and identifiel. Whereas, the irradiation of p-nitrophenylacetate (XIX) of 3-epi-dammaranediol-II (XVI) under the similar condition followed by saponification yielded the 12-hydroxy compound (XX). This was converted into betulafolienetriol (XXI) and 20 (S)-protopanaxadiol (I) furnishing the synthesis of the Ginseng sapogenin.