Metal-Free Synthesis of <i>N</i>-Aryl-Substituted Azacycles from Cyclic Ethers Using POCl<sub>3</sub>
作者:Minh Thanh La、Soosung Kang、Hee-Kwon Kim
DOI:10.1021/acs.joc.9b00377
日期:2019.6.7
A facile method for the synthesis of N-aryl-substituted azacycles from arylamines and cyclic ethers has been developed. In this study, arylamines were treated with cyclic ethers in the presence of POCl3 and DBU to provide five- and six-membered azacycles. Using this method, various azacycloalkanes, isoindolines, and tetrahydroisoquinolines were prepared in high yields. This synthetic method offers
Phosphoryl chloride-mediated solvent-free synthesis of N-aryl-substituted azacycles from arylamines and cyclic ethers
作者:Van Hieu Tran、Minh Thanh La、Hee-Kwon Kim
DOI:10.1016/j.tetlet.2019.06.019
日期:2019.7
cyclic ethers is described. In this method, the combination of POCl3 and DBU is crucial for conversion of arylamines and cyclic ethers to five- and six-membered azacycles. Without solvent, a variety of N-aryl-substituted, five-membered azacycles (pyrrolidines, 2-methylpyrrolidines, and piperidine) and six-membered azacycles (isoindolines and tetrahydroisoquinolines) are synthesized in high yields. This
Practical direct synthesis of <i>N</i>-aryl-substituted azacycles from <i>N</i>-alkyl protected arylamines using TiCl<sub>4</sub> and DBU
作者:Van Hieu Tran、Minh Thanh La、Soosung Kang、Hee-Kwon Kim
DOI:10.1039/d0ob00880j
日期:——
A noveltransformation of N-alkyl protected arylamines and cyclic ethers into N-aryl substituted azacycles is described. Alkyl groups have been used for the protection of amines in organic syntheses. In this synthesis, N-alkyl protected arylamines were reacted with cyclic ethers in the presence of TiCl4 and DBU, crucial reagents affording five- and six-membered azacycles. In particular, utilization
Boron trifluoride-mediated synthesis of N-aryl-substituted pyrrolidines from tetrahydrofuran and amines
作者:Shanshan Hu、Yan Huo、Zhihong Wang
DOI:10.1007/s10593-018-2220-3
日期:2017.12
Boron trifluoride-mediated transformation of tetrahydrofuran to corresponding N-aryl-substituted pyrrolidines is conducted under mild reaction conditions, providing a practical synthetic method with reasonable yields. Computational studies confirmed the reaction mechanism involving a fast Lewis acid-assisted ring-opening step, followed by the 7-membered intermediate formation and a ringclosing process