Benzylic C(sp<sup>3</sup>)H Perfluoroalkylation of Six-Membered Heteroaromatic Compounds
作者:Yoichiro Kuninobu、Masahiro Nagase、Motomu Kanai
DOI:10.1002/anie.201505335
日期:2015.8.24
Successful benzylicC(sp3)H trifluoromethylation, pentafluoroethylation, and heptafluoropropylation of six‐membered heteroaromaticcompounds were achieved as the first examples of a practical benzylicC(sp3)Hperfluoroalkylation. In these reactions, BF2CnF2n+1 (n=1–3) functioned as both a Lewis acid to activate the benzylic position and a CnF2n+1 (n=1–3) source. The perfluoroalkylation proceeded at
成功苄C(SP 3) ħ三氟甲基化,pentafluoroethylation,和的六元杂芳族化合物heptafluoropropylation分别实现为实用的第一实例苄基C(SP 3) ħ全氟烷基化。在这些反应中,BF 2 C n F 2 n +1(n = 1–3)既充当路易斯酸以激活苄基位置,又充当C n F 2 n +1(n= 1–3)源。全氟烷基化在烷基链的末端和内部进行。全氟烷基化产物以中等至优异的产率获得,即使以克为单位,也可以不分离中间体而按顺序进行。通过使用该方法,生物活性化合物的三氟甲基化以及将CF 3基引入生物活性分子骨架中在区域上进行。
TAGAWA, YOSHINOBU;HONJO, NORIKO;GOTO, YOSHINOBU, CHEM. AND PHARM. BULL., 1986, 34, N 2, 564-571
Transition-Metal-Free Regioselective Alkylation of Quinoline N-Oxides via Oxidative Alkyl Migration and C−C Bond Cleavage of tert-/sec-Alcohols
作者:Chiranjit Sen、Subhash C. Ghosh
DOI:10.1002/adsc.201701330
日期:2018.3.1
An unprecedented C2‐alkylation of quinoline N‐oxide derivatives via C−C bond activation of tert‐ and sec‐alkyl alcohol is described using hypervalent iodine (III) reagent PhI(OAc)2 (PIDA). This regioselective alkylation using mild hypervalent iodine reagents is more practical, operationally simple and transition metal free. The reaction proceeds efficiently with a broad range of substrates including