作者:Jinn-Hsuan Ho、Tong-Ing Ho
DOI:10.1002/jccs.200300015
日期:2003.2
results from the unfavorable singlet excitation energy (E 0 , 0 ) and oxidation potential. Regioselective amination by ammonia to the radical cations of 1a-1e has occurred to afford 1-amino-1-aryl-2-(thien-2-yl)ethanes (2a-2e) in reasonable yields (50-90%). The regioselectivity arises from the attack of ammonia at the localized positive charge on C-1 of the ethene bond of the radical cations of 1a-1e
由 Rehm-韦勒方程。这导致形成 1a-1f 的自由基阳离子和 p-DCB 的自由基阴离子。由于不利的单线态激发能(E 0 , 0 )和氧化电位导致ΔG ET 值为正,对硝基衍生物1g不能产生自由基阳离子。通过氨对 1a-1e 的自由基阳离子进行区域选择性胺化,以合理的收率 (50-90%) 提供 1-氨基-1-芳基-2-(噻吩-2-基)乙烷 (2a-2e)。区域选择性源于氨对 1a-1e 自由基阳离子乙烯键 C-1 上的局部正电荷的攻击。