Chemistry of labdanediol from Cistus ladaniferus, L. synthesis of 12-Nor-ambreinolide and α and β-levantenolides
摘要:
Labdanediol, 2. the major component of the neutral part of Cistus ladaniferus L, was transformed into 12-nor-ambreinolide, precursor of ambrox(R), in three steps with an overall yield of 70%. Molecular modelling techniques have been used to determine the stereochemistry of the byproducts of these reactions. The selenylation and elimination reactions of alpha and betalevantanolides, obtained from labdanediol, 2, were used to synthetise alpha and beta-levantenolides.
Labdanediol, 2. the major component of the neutral part of Cistus ladaniferus L, was transformed into 12-nor-ambreinolide, precursor of ambrox(R), in three steps with an overall yield of 70%. Molecular modelling techniques have been used to determine the stereochemistry of the byproducts of these reactions. The selenylation and elimination reactions of alpha and betalevantanolides, obtained from labdanediol, 2, were used to synthetise alpha and beta-levantenolides.
Turkish tobacco—I
作者:J.A. Giles、J.N. Schumacher
DOI:10.1016/s0040-4020(01)92174-x
日期:1961.1
Two hitherto unknown diterpene lactones have been isolated from Turkish tobacco. Characterization studies show that these compounds, now called α- and β-levantenolides, are represented by I and II. The levantenolides differ only in being epimeric at C12, and are closely related to labdanolic acid.