选择环:叔丁基二甲基甲硅烷基叔丁基硫酸盐(TBSOTf)/ NEt 3处理与双环烷酮相连的炔基酯会形成三环烯酸酯,在环结处具有总的非对映选择性。涉及由TBSOTf / NEt 3双重激活促进的分子内的醇酸Mukaiyama aldol反应。(±)-hamigeran B的正式总合成说明了这种新颖的方法。
选择环:叔丁基二甲基甲硅烷基叔丁基硫酸盐(TBSOTf)/ NEt 3处理与双环烷酮相连的炔基酯会形成三环烯酸酯,在环结处具有总的非对映选择性。涉及由TBSOTf / NEt 3双重激活促进的分子内的醇酸Mukaiyama aldol反应。(±)-hamigeran B的正式总合成说明了这种新颖的方法。
The treatment Of Propargylic esters tethered to bicyclo[3.2.0]heptanone, 2-methylindanone, 2-methyltetralone, or 2-methylsuberone led to fused tricyclic allenoates by an intramolecular alkynylogous Mukaiyama aldol type reaction promoted by TBSOTf/NEt(3), the key intermediates being silylalkynylketene acetals. (c) 2008 Elsevier Ltd. All rights reserved.
Intramolecular Alkynylogous Mukaiyama Aldol Reaction Starting from Bicyclic Alkanones Tethered to Alkynyl Esters: Formal Total Synthesis of (±)-Hamigeran B
esters tethered to bicycloalkanones leads to the formation of tricyclic allenoates with total diasteroselectivity at the ring junction. An intramolecular alkynylogous Mukaiyama aldol reaction promoted by a TBSOTf/NEt3 dual activation is involved. This novel methodology was illustrated by a formaltotalsynthesis of (±)‐hamigeran B.
选择环:叔丁基二甲基甲硅烷基叔丁基硫酸盐(TBSOTf)/ NEt 3处理与双环烷酮相连的炔基酯会形成三环烯酸酯,在环结处具有总的非对映选择性。涉及由TBSOTf / NEt 3双重激活促进的分子内的醇酸Mukaiyama aldol反应。(±)-hamigeran B的正式总合成说明了这种新颖的方法。