3α-Acetoxy-6,6-dimethylbicyclo[3.1.1]heptane-2-spiro-1′-cyclopropane from nopylamine deamination
作者:Raymond J. Abraham、Richard Jones-Parry、Rodney M. Giddings、Jonathan Guy、David Whittaker
DOI:10.1039/a707911g
日期:——
Deamination of nopylamine hydrochloride with sodium nitrite in acetic acid yields nopyl chloride 8, nopyl acetate 1 (R = OAc), 2-(1-acetoxyethyl)-6,6-dimethylbicyclo[3.1.1]hept-2-ene 9 and 3α-acetoxy-6,6-dimethylbicyclo[3.1.1]heptane-2-spiro-1â²-cyclopropane 12. The products are consistent with initial formation of a diazonium ion which reacts by nucleophilic attack, hydride shift or by shift of electrons of the double bond. The reaction is contrasted with the acetolysis of nopyl toluene-p-sulfonate, which yields 8,8-dimethyltricyclo[4.2.1.03,7]nonan-6-ol as the main product. The difference is suggested to result from the transition state being reached early (deamination) or late (toluene-p-sulfonate acetolysis) on the reaction coordinate.
在乙酸中,用亚硝酸钠对盐酸壬胺进行脱氨基,得到氯化壬酯 8、乙酸壬酯 1 (R = OAc)、2-(1-乙酰氧基乙基)-6,6-二甲基双环[3.1.1]庚-2-烯 9 和3α-乙酰氧基-6,6-二甲基双环[3.1.1]庚烷-2-螺-1-环丙烷 12。产物与重氮离子的初始形成一致,该重氮离子通过亲核攻击、氢化物移位或通过移位进行反应双键的电子数。该反应与对甲苯磺酸壬酯的乙酰解反应形成对比,后者产生主要产物8,8-二甲基三环[4.2.1.03,7]壬-6-醇。这种差异被认为是由于反应坐标上过渡态提前(脱氨)或较晚(甲苯-对-磺酸酯乙酰解)达到的结果。