Formal total synthesis of the myxobacteria metabolite apicularen A via a transannular oxy-Michael addition
作者:Ferdows Hilli、Jonathan M. White、Mark A. Rizzacasa
DOI:10.1016/j.tet.2011.04.002
日期:2011.7
The formal total synthesis of the myxobacteria metabolite (−)-apicularen A (1) is described. The key step utilized to construct the 2,6-trans-disubstituted tetrahydropyran ring was the transannular oxy-Michael addition of enone (+)-48 to form trans-pyranone (+)-50. Cyclisation of the C13 epimer (−)-49 also gave the same trans-pyranone (+)-50 demonstrating that the stereochemistry of the apicualren
描述了粘菌代谢物(-)-apicularen A(1)的正式全合成。用于构建2,6-反式-二取代的四氢吡喃环的关键步骤是烯酮(+)- 48的跨环氧基-迈克尔加成反应,从而形成反式-吡喃酮(+)- 50。C13差向异构体(-)- 49的环化也得到相同的反式-吡喃酮(+)- 50,表明阿皮瓜仁环系统的立体化学只能由C15不对称中心控制。还原(+)- 50中的酮并脱甲基,得到高级的针状中间体4完成天然产物的正式全部合成1。