Stereoselective total synthesis of dinemasone A by double intramolecular hetero-Michael addition (DIHMA)
作者:Gangavaram V. M. Sharma、Gourishetty Srikanth、Pothula Purushotham Reddy
DOI:10.1039/c2ob26396c
日期:——
The first total synthesis of dinemasone A, a bioactive metabolite with a spiroketal moiety, is described. The main strategy for the construction of the spiroketal unit involves a double intramolecular hetero-Michael addition (DIHMA) of an ynone moiety. The thus obtained axial–equatorial mono anomeric spiroketal, on spiroepimerization with ZnBr2, was converted into the requisite axial–axial double anomeric
描述了地inemasone A(具有螺环部分的生物活性代谢物)的第一个全合成。螺环单元构建的主要策略涉及炔酮部分的双分子内异-迈克尔加成(DIHMA)。如此获得的轴向-赤道单异头螺帽,在用ZnBr 2螺旋异构化后,转化为必需的轴向-轴向双异头螺帽。由四个手性炔丙醇(C5–C11片段)和二羟基醛(C1–C4片段)制备具有四个立体中心的炔酮部分,然后从D-甘露醇 和 巴豆醇 分别。