Synthetic entry to 8-(o-nitrophenyl-2-azabicyclo[3.3.1]nonan-7-ones. Intermediates for the synthesis of strychnos-type systems.
作者:Josep Bonjoch、Josefina Quirante、Manuel Rodriguez、Joan Bosch
DOI:10.1016/s0040-4020(01)90353-9
日期:1988.1
The first synthetic route to 8-aryl-2-azabicyclo-[3.3.1]nonan-7-ones (e.g. 5) is reported. The synthesis involves acid cyclization of an appropriate 4-acetonyl-2-piperidinecarbonitrile (4) which, in turn, is obtained from the corresponding piperidine (3) by a modified Polonovski reaction. The o-nitrophenyl substituent of 3 is introduced by arylation of 4-piperidineacetoacetate 1 with o-fluoronitrobenzene
报道了合成8-芳基-2-氮杂双环-[3.3.1]壬南-7-酮(例如5)的第一条合成路线。合成涉及适当的4-丙酮基-2-哌啶甲腈(4)的酸环化,其又通过修饰的Polonovski反应从相应的哌啶(3)获得。通过使4-哌啶基乙酰乙酸酯1与邻氟硝基苯芳基化,然后进行酸水解,引入3的邻硝基苯基取代基。还报道了α-(邻-硝基苯基)酮5到桥连的偶氮基吲哚7的转化,这是合成脱乙基哌氟丁的中间体。