A New Access to Multifunctional Linear Triquinanes and Their Homologues via ?,?-Unsaturated Fischer Carbene Complexes
作者:Yao-Ting Wu、Denis Vidovic、J�rg Magull、Armin de Meijere
DOI:10.1002/ejoc.200400858
日期:2005.4
corresponding protected (2'-oxocycloalkyl)methyl-substituted cyclopentadienes 6, which were obtained by cocyclization of the alkynes 5 with the β-dimethylamino-substituted α,β-unsaturated Fischer carbene complexes 4 in 38–81 % yield (6 examples with 66–81 %). In most cases, the cis,anti,cis-isomers anti-7 were the major products. While the twofold cis-fusion is favored by minimal ring strain, hydrogen
具有 [5-5-x] (x = 5, 6, 7) 环大小组合的 12 个不同取代的三环羟基酮 7, 8 以 43-91 % 的产率一步制备(10 个实例的产率为 74-91 % ) 来自相应的受保护的 (2'-氧代环烷基) 甲基取代的环戊二烯 6,这是通过炔烃 5 与 β-二甲氨基取代的 α,β-不饱和 Fischer 卡宾配合物 4 以 38-81% 的产率共环化获得的 (6 66–81% 的示例)。在大多数情况下,顺式、反式、顺式异构体 anti-7 是主要产物。虽然双顺式融合有利于最小的环应变,但羟基和羰基之间的氢键可能有利于三环骨架的反构型。羟基酮抗 7aa、抗 7ba、anti-7ca 分别提供了相应的三环二烯 15aa/16aa、15ba 和 15ca/16ca。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany