The copper‐mediated fluroalkylation/cyclization of N‐allyl anilines has been described with unactivated double bonds as the radical acceptor. The reaction provides an efficient and direct access to 3‐fluoroalkyl indolines in moderate to good yields. This protocol combines a simple experimental procedure with low‐costing fluoroalkylated sources and excellent functional group tolerance.
Manganese-Catalyzed <i>N</i>-Alkylation of Sulfonamides Using Alcohols
作者:Benjamin G. Reed-Berendt、Louis C. Morrill
DOI:10.1021/acs.joc.9b00203
日期:2019.3.15
An efficient manganese-catalyzed N-alkylation of sulfonamides has been developed. This borrowing hydrogen approach employs a well-defined and bench-stable Mn(I) PNP pincer precatalyst, allowing benzylic and simple primary aliphatic alcohols to be employed as alkylating agents. A diverse range of aryl and alkyl sulfonamides undergoes mono-N-alkylation in excellent isolated yields (32 examples, 85% average
A cobalt‐catalyzed 1,4‐aryl migration/disulfonylation cascade applied to α‐bromo N‐sulfonyl amides was developed. The reaction was highly chemoselective, allowing the preparation of α‐arylamides possessing a variety of functional groups. The method was used as the key step to synthesize an alkaloid, (±)‐deoxyeseroline. Mechanistic investigations suggest a radical process.
Synthesis of CF<sub>3</sub>CH<sub>2</sub>-Containing Indolines by Transition-Metal-Free Aryltrifluoromethylation of Unactivated Alkenes
作者:Deqiang Liang、Qishan Dong、Penghui Xu、Ying Dong、Weili Li、Yinhai Ma
DOI:10.1021/acs.joc.8b01861
日期:2018.10.5
With an unactivated double bond as the radical acceptor, allyl amines underwent a metal-free trifluoromethylation/cyclization cascade with CF3SO2Na (Langlois’ reagent), affording CF3CH2-containing indolines and tetrahydroisoquinolines, whose practical syntheses are significant challenges. This protocol features mild conditions, low cost, and a broad substrate scope.
烯丙基胺以未活化的双键作为自由基受体,与CF 3 SO 2 Na(Langlois试剂)进行了无金属的三氟甲基化/环化级联反应,从而提供了包含CF 3 CH 2的二氢吲哚和四氢异喹啉,它们的实际合成面临重大挑战。该协议具有条件温和,成本低和基材范围广的特点。
Green and Scalable Aldehyde-Catalyzed Transition Metal-Free Dehydrative<i>N-</i>Alkylation of Amides and Amines with Alcohols
作者:Qing Xu、Qiang Li、Xiaogang Zhu、Jianhui Chen
DOI:10.1002/adsc.201200881
日期:2013.1.14
which alcohols were activated by transition metal‐catalyzed anaerobic dehydrogenation, the addition of external aldehydes was accidentally found to be a simple and effective protocol for alcohol activation. This interesting finding subsequently led to an efficient and green, practical and scalable aldehyde‐catalyzed transition metal‐free dehydrative N‐alkylation method for a variety of amides, amines