title: Synergistic Acid-Catalyzed Synthesis of N-Aryl-Substituted Azacycles from Anilines and Cyclic Ethers.
abstract: A metal-free and efficient approach to N-aryl-substituted azacycles from arylamines and cyclic ethers is described. In this synthesis, the synergistic effect between Lewis and Brønsted acids is crucial to the ring-opening of cyclic ethers and the subsequent cyclization. The use of B(C6F5)3 enabled the formation of frustrated Lewis pairs (FLPs) from the reactants, and the resulting FLPs allowed ready access to the N-arylazacycles in moderate to good yields via further cyclization. Water is the sole waste resulting from the reaction, thereby making it an environmentally benign process.
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.|University of Chinese Academy of Sciences , Beijing 100049, P. R. China.
authors.forename: Zhenbei
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Chengxia
authors.initials: C
authors.lastname: Miao
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Chungu
authors.initials: C
authors.lastname: Xia
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Sun