Hypervalent Iodine(III)‐Mediated Regioselective Cyanation of Quinoline
<i>N</i>
‐Oxides with Trimethylsilyl Cyanide
作者:Feng Xu、Yuqin Li、Xin Huang、Xinjie Fang、Zhuofei Li、Hongshuo Jiang、Jingyi Qiao、Wenyi Chu、Zhizhong Sun
DOI:10.1002/adsc.201801185
日期:2019.2
A regioselective cyanation of quinoline N‐oxides with trimethylsilyl cyanide was developed by using (Diacetoxyiodo) benzene (PIDA) as mediated hypervalentiodine(III) reagent under metal‐free and base‐free reaction conditions to obtain 2‐cyanoquinolines. The efficient PIDA reagent could play the role of an activator of the substrates and an accelerator of N−O bond cleavage. The reaction system featured
A molecular iodine catalyzed regioselective insertion of isocyanide into C2-H of quinoline N-oxides has been developed. The reaction proceeds through the nucleophilic addition of isocyanide on quinoline N-oxides followed by rearrangement in presence of iodine. This metal-free reaction affords rapid access to quinoline 2-formamides with exceptional functional group tolerance, broad substrate scope and
Gold-Catalyzed Regio- and Stereoselective Alkenylation of Quinoline N-Oxides with Allenamides
作者:Mingduo Lu、Yuanhong Liu
DOI:10.1021/acs.orglett.4c01796
日期:2024.7.5
A gold-catalyzed cycloaddition/ring opening of allenamides with quinolineN-oxides has been developed, which provides C2-alkenylated quinolines with high E selectivity in moderate to high yields. It is noted that quinolineN-oxides with a C8 or C7 substituent are crucial for this catalytic reaction.
A highly efficient and regioselective Rh(III)-catalyzed protocol for C8-bromination and amidation of quinoline N-oxide was developed. The transformation was found to be successful up to gram scale with excellent functional group tolerance and wide substrate scope. The mechanistic study revealed five-membered rhodacycle with quinoline N-oxide as a key intermediate for regioselective C8-functionalization. In addition, NFSI (N-fluorobis-(phenylsulfonyl)-imide) was explored as an amidating reagent for C8-amidation of quinoline N-oxide for the first time.