Control of Regioselectivity by the <i>l</i><i>one</i> Substituent through Steric and Electronic Effects in the Nitrosoarene Ene Reaction of Deuterium-Labeled Trisubstituted Alkenes
作者:Waldemar Adam、Oliver Krebs、Michael Orfanopoulos、Manolis Stratakis
DOI:10.1021/jo026198i
日期:2002.11.1
For the ene reaction of 4-nitronitrosobenzene (ArNO) with a variety of primary and secondary lone alkyl-substituted substrates, the twix/twin regioselectivity is constant at about 85:15. In contrast, for the lone tert-butyl group and for lone aryl substituents, the twix regioisomer is obtained exclusively. These regioselectivities have been rationalized in terms of steric interactions and coordination
对于4-硝基亚硝基苯(ArNO)与多种伯和仲孤烷基取代的底物的烯反应,twix / twin区域选择性恒定在约85:15。相反,对于单独的叔丁基和对于单独的芳基取代基,仅获得twix区域异构体。这些区域选择性已经在第一步反应的过渡态中,在亲和体与底物之间的空间相互作用和配位方面得到了合理化。