Studies on the synthesis of reidispongiolide A: stereoselective synthesis of the C(22)–C(36) fragment
作者:Maben Ying、William R. Roush
DOI:10.1016/j.tet.2011.10.029
日期:2011.12
A highly stereoselectivesynthesis of the C(22)–C(36) fragment 2 of reidispongiolide A is described. This synthesis features the highly stereoselective mismatched double asymmetric crotylboration reaction of the aldehyde derived from 5 and the new chiral reagent (S)-(E)-7 that provides 12 with >15:1 dr. Subsequent coupling of the derived vinyl iodide 3 with aldehyde 16 provided allylic alcohol 17,
描述了 reidispongiolide A的 C(22)–C(36) 片段2的高度立体选择性合成。这种合成的特点是来自5的醛和新的手性试剂 ( S )-( E ) -7的高度立体选择性错配双不对称巴豆基硼化反应,为12提供 >15:1 dr。衍生的乙烯基碘3与醛16 的后续偶联提供了烯丙醇17,通过三个步骤将其加工成目标 reidispongiolide 片段2。