作者:Juan Murga、Jorge Garcı&#x;a-Fortanet、Miguel Carda、J.Alberto Marco
DOI:10.1016/j.tetlet.2003.09.007
日期:2003.10
issues, but also in the placement of one of the hydroxyl groups of the side chain. By means of an unambiguous synthesis, passifloricin A is shown to be the δ-lactone of 2Z,5R,7S,9S,12S-tetrahydroxyhexacos-2-enoic acid. All of the stereogenic centres were created with the aid of Brown's asymmetric allylation methodology. The lactone ring was made via ring-closing metathesis.
文献中报道的具有药理活性的天然内酯西番弗霉素A的结构(2 Z,5 R * S *,7 R *,9 S *,11 S *-四羟基己糖-2-烯酸的δ-内酯)不正确不仅在立体化学方面,而且在侧链的羟基之一的位置。通过明确的合成,西番莲A被证明是2 Z,5 R,7 S,9 S,12 S的δ-内酯-四羟基己糖-2-烯酸。所有的立体定向中心都是在布朗的不对称烯丙基化方法的帮助下创建的。内酯环通过闭环复分解反应制得。