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
Visible‐Light‐Induced Controlled Oxidation of
<i>N</i>
‐Substituted 1,2,3,4‐Tetrahydroisoquinolines for the Synthesis of 3,4‐Dihydroisoquinolin‐1(2
<i>H</i>
)‐ones and Isoquinolin‐1(2
<i>H</i>
)‐ones
作者:Ajay H. Bansode、Gurunath Suryavanshi
DOI:10.1002/adsc.202001266
日期:2021.3.2
controlled oxidation of N‐substituted 1,2,3,4‐tetrahydroisoquinolines is developed for the synthesis of 3,4‐dihydroisoquinolin‐1(2H)‐ones and isoquinolin‐1(2H)‐ones. The present method feature's a broad substrate scope, good functional group tolerances, and the products were prepared in good to excellent yields. The developed methodology further demonstrated in the synthesis of isoindolo[2,1‐b] isoquinolin‐5(7H)‐one
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
An anthraquinone-containing polymericphotosensitizer (AQ-PHEMA) can catalyze the cross-dehydrogenative-coupling of N-aryl tetrahydroisoquinolines with several nucleophiles (nitromethane, 1-methyl-2-alkyl ketone and dialkyl (aryl) phosphine oxide) efficiently by visible light to afford a series of 1-substituted-2-aryl-1,2,3,4-tetrahydroisoquinolines in good to excellent yields with nice substrate tolerance
Potassium Alkylpentafluorosilicates, Primary Alkyl Radical Precursors in the C-1 Alkylation of Tetrahydroisoquinolines
作者:Teng Wang、Dong-Hui Wang
DOI:10.1021/acs.orglett.9b01124
日期:2019.6.7
alkylpentafluorosilicates (RSiF5K2) are efficient primary alkyl radical precursors for selective C(sp3)–C(sp3) bond-forming reactions. RSiF5K2 reagents are white, free-flowing solids and are moisture and air stable. This class of reagents enables the direct C-1 alkylation of tetrahydroisoquinolines under mild conditions via single-electron transfer. The broad substrate scope of both alkylpentafluorosilicates and
在这项研究中,我们证明了烷基五氟硅酸钾(RSiF 5 K 2)是选择性C(sp 3)–C(sp 3)键形成反应的有效伯烷基自由基前体。RSiF 5 K 2试剂是白色的,可自由流动的固体,对湿气和空气稳定。这类试剂可在温和条件下通过单电子转移将四氢异喹啉直接C-1烷基化。在该转化中,烷基五氟硅酸盐和四氢异喹啉都具有宽泛的底物范围。自由基清除剂和EPR捕获实验均表明,主要自由基是由RSiF 5 K 2的氧化产生的。提出了一种机制,该机制涉及将烷基自由基加到亚胺盐中,然后用胺还原。