Chemo- and regioselectivity in the Lewis acid-induced reaction of sterically unhindered isocyclic allylsilanes with 3-butyn-2-one
作者:Honoré Monti、Gérard Audran、Michel Feraud、Jean-Pierre Monti、Gilbert Léandri
DOI:10.1016/0040-4020(96)00319-5
日期:1996.5
The primordial influence of the ring size in the Lewis acid-promoted reaction of sterically unhindered isocyclic allylsilanes with 3-butyn-2-one is reported. In all the cases, the classical Sakurai-Hosomi reaction is, for the most part or fully, suppressed. With cyclohexanic frameworks, allyltrimethylsilanes like 1a-c afford mainly or solely H-ene components. This chemoselectivity is quite different
据报道,在空间不受阻碍的杂环烯丙基硅烷与3-butyn-2-one的路易斯酸促进的反应中,环大小的原始影响。在所有情况下,经典的樱井-细森反应在很大程度上或完全被抑制。对于环己构架,烯丙基三甲基硅烷(如1a-c)主要或仅提供H-烯组分。这种化学选择性与主要用作[2 + 2]环加成剂的环戊烷核心化合物1d-f完全不同,而只是牺牲了H-烯产物的工艺。此外,对于两个骨架,H-烯产物形成的区域选择性相反。使用我2AlCl,五个碳原子的杂环烯丙基硅烷的[2 + 2]缩合反应,具有完全的化学选择性,可提供功能化双环[3]的有效合成。2. 0]庚烯。