2-Azabicyclo[2.1.1]hexanes. 2. Substituent Effects on the Bromine-Mediated Rearrangement of 2-Azabicyclo[2.2.0]hex-5-enes
作者:Grant R. Krow、Yoon B. Lee、Walden S. Lester、Nian Liu、Jing Yuan、Jingqi Duo、Seth B. Herzon、Yen Nguyen、David Zacharias
DOI:10.1021/jo0015570
日期:2001.3.1
and some allylic bromide 10. Both unrearranged 5-endo,6-exo-dibromo-2-azabicyclo[2.2.0]hexanes 8 and rearranged 5-anti-6-anti-dibromo-2-azabicyclo[2.1.1]hexanes 9 are formed stereoselectively. The dibromoazabicyclo[2.1.1]hexanes 9 have been reductively debrominated to afford the first reported 2-azabicyclo[2.1.1]hexanes 11 with alkyl or aryl substituents at C-3.
甲基和苯基取代的N-(乙氧基羰基)-2-氮杂双环[2.2.0]己-5-烯6通过光辐射适当取代的1,2-二氢吡啶制备。从2-甲基-和2-苯基-1,2-二氢吡啶5c-合成3-endo-methyl-和3-endo-phenyl-2-azabicyclo [2.2.0] hexenes 6c-e时观察到了对甲苯磺酸的选择性。 e。在将溴加到3-内-,4-和5-内-和3-内-苯基取代的N-(乙氧羰基)-2-氮杂双环[2.2.0]六-5-烯6a-f上形成的产物是取代基依赖性的。对于在C(3)或C(5)上没有取代基的6a,b,获得了未重排的二溴化物8a,b和重排的二溴化物9a,b的混合物。用6c-e中的3-内-取代基,仅形成重排的二溴化物9c-e。5-甲基取代主要产生未重排的二溴化物8f和一些烯丙基溴化物10。立体选择性地形成未重排的5-内-,6-外-二溴-2-氮杂双环[2.2.0]己烷8和重排的5-抗-6-反二溴-2-氮杂双环[2