Enantioselective synthesis of the unnatural antipode of cordiaquinone B possesing a 3-substituted 2,3,4-trimethylcyclohexanone framework was accomplished starting with (4S, 5S)-4-methyl-5-trimethylsilyl-2-cyclohexen-1-one. By this synthesis, the absolute structure of (+)-cordiaquinoneB has been established.
Meroterpenoid naphthoquinones from Cordia corymbosa
作者:Lothar W. Bieber、Irene Messana、Sandra C.N. Lins、Álvaro A. da Silva Filho、Alda A. Chiappeta、José F. De Méllo
DOI:10.1016/0031-9422(90)85047-j
日期:——
Cordiaquinones A and B, the first examples of a new type of merosesquiterpenoid quinones, have been isolated from the roots of Cordia corymbosa. The structures of these 6-alkylsubstituted 1,4-naphthoquinones were elucidated by high field 1H NMR spectroscopy, mass spectrometry and chemical derivatization.
Cordiaquinones A 和 B 是新型merosesquiterpenoid quinones 的第一个例子,已经从Cordia corymbosa 的根中分离出来。这些 6-烷基取代的 1,4-萘醌的结构通过高场 1H NMR 光谱、质谱和化学衍生化进行了阐明。