A palladium-catalyzed carbon–carbon bond activation-initiated reaction of 2-(3-phenyloxiran-2-yl)benzonitriles with arylboronic acids is reported. Multiple chemical bonds were cleavaged and reconstructed via β-carbon elimination in this reaction, enabling the construction of valuable benzo-fused dipyrromethenes that are difficult to prepare by other methods. Additionally, a series of benzannulated
Phosphine-Catalyzed Remote β-CH Functionalization of Amines Triggered by Trifluoromethylation of Alkenes: One-Pot Synthesis of Bistrifluoromethylated Enamides and Oxazoles
作者:Peng Yu、Sheng-Cai Zheng、Ning-Yuan Yang、Bin Tan、Xin-Yuan Liu
DOI:10.1002/anie.201412310
日期:2015.3.23
An unprecedented phosphine‐catalyzed remote β‐CH functionalization of amine derivatives triggered by trifluoromethylation of an alkene with Togni’s reagent was disclosed. This reaction proceeded through the highly selective and concomitant activation of an unactivated alkene and the β‐CH bond of an amine derivative, providing bistrifluoromethylated enamides in excellent yields with good regio‐, chemo‐
Herein is introduced the application of “super-electron-donor”(SED) 2-azaallylanions in a tandem reduction/radical cyclization/radical coupling/aromatization protocol that enables the rapid construction of isoquinolines. The value of this transition-metal-free method is highlighted by the wide range of isoquinoline ethyl amines prepared with good functional group tolerance and yields. An operationally
described. Importantly, these photocatalytic transformations feature good functional group tolerance and high regio- and chemoselectivities undermild reaction conditions. These findings might stimulate the exploration of new photocatalytic utilizations of P(O)–Hcompounds by employing CN-containing substrates as the radical acceptors.