Intramolecular reactions involving positions C(2), C(6) and (C2), C(7) in the bicyclo[3.3.1]nonane ring system
作者:Roger Bishop、William Parker、James Ronald Stevenson
DOI:10.1039/p19810000565
日期:——
Reactions likely to involve C(2)–C(6) and C(2)–C(7) intramolecular reactions in bicyclo[3.3.1]nonane derivatives are discussed in terms of the conformations available to the ring system. While endo-6-hydroxybicyclo[3.3.1]-nonan-2-one (11) incorporated three deuterium atoms (excluding the hydroxy-group) on heating with NaOD, the exo-isomer (17) exchanged the six hydrogens adjacent to the oxygenation
关于双环[3.3.1]壬烷衍生物中可能涉及C(2)–C(6)和C(2)–C(7)分子内反应的反应,根据环系统可用的构象进行了讨论。虽然内与NaOD加热-6-羟基双环[3.3.1] -nonan -2-酮(11)引入的三种氘原子(不包括羟基基团)时,外异构体(17)交换邻近六个氢氧合功能但不具有羰基质子。证据表明,立体定向碱基诱导的2,6-氢化物迁移很可能是通过双扭转船的过渡状态。用HCl水溶液在丙酮中处理6,6-乙二氧基-2-甲氧基亚甲基双环-[3.3.1]壬烷(36)以高收率产生2-羟基原金刚烷-10-酮(38)。该过程是由于含氧基团的水解而产生的,从而释放出内部的酮醛中间体(37),该中间体随后在C(2)醛与C(7)之间进行了分子内羟醛缩合。