作者:Hirokazu Arimoto、Rieko Yokoyama、Kazuhiko Nakamura、Yasuaki Okumura、Daisuke Uemura
DOI:10.1016/0040-4020(96)00852-6
日期:1996.10
The synthesis of vallartanone B, a γ-pyrone-containing polypropionate from the marine mollusc Siphonaria maura, is described. A γ-pyrone moiety, which was constructed by PPh3-CCl4 cyclization of a β-triketone, and a C1-C6 segment were joined by a Sn(OTf)2 aldol reaction and converted to vallartanone B. This synthesis allows for revision of the stereochemistry at C8. A conformational analysis was performed
描述了从海洋软体动物Siphonaria maura合成vallartanone B(一种含γ-吡喃酮的聚丙烯酸酯)的方法。通过PPh 3 -CCl 4环化β-三酮构建的γ-吡喃酮部分和C1-C6片段通过Sn(OTf)2醛醇缩合反应连接并转化为缬拉坦B。在C8的立体化学。使用PM3进行了构象分析,以检查拟议的CD光谱解释。