A tandem annulation of arylpropynols with disulfides has been developed for the synthesis of 2-sulfenylindenone derivatives. The reaction pathway involves one-pot tandem Meyer–Schusterrearrangement of arylpropynols and successive radical cyclization with disulfides. Various arylpropynols and disulfides with a number of functional groups are compatible in this reaction that affords the corresponding
Tandem Amination/Cycloisomerization of Aryl Propargylic Alcohols with 2-Aminopyridines as an Expedient Route to Imidazo[1,2-a]pyridines
作者:Ping Liu、Chun-Lin Deng、Xinsheng Lei、Guo-qiang Lin
DOI:10.1002/ejoc.201101053
日期:2011.12
A new tandemroute leading to imidazo[1,2-a]pyridines has been explored through the direct amination of arylpropargylicalcohols with 2-aminopyridines and their subsequent intramolecular cycloisomerization. A ZnCl2/CuCl system has been developed to promote this transformation, which resulted in various imidazo[1,2-a]pyridines in moderate to good yields.
Straightforward Stereoselective Synthesis of Seven-Membered Oxa-Bridged Rings through <i>In Situ</i> Generated Cycloheptenol Derivatives
作者:Mengdan Wang、Liqiang Yin、Lu Cheng、Yajie Yang、Yanzhong Li
DOI:10.1021/acs.joc.1c01648
日期:2021.9.17
An iodine-mediated stereoselective synthesis of seven-membered oxa-bridged rings via in situ generated cycloheptenols was reported. This process was realized through the combination of C–C σ-bond cleavage and C–O bond-forming reactions in a one-pot fashion from simple and easily accessible raw materials. The formation of carbon radicals initiated by I2 was the key to the reaction.
Regioselective
<scp>Bismuth‐Catalyzed</scp>
Synthesis of Pyranocoumarins and Furocoumarins from
<scp>4‐Hydroxycoumarins</scp>
and Propargyl Alcohols
作者:Jaehyun Kim、Kooyeon Lee、Phil Ho Lee
DOI:10.1002/bkcs.12058
日期:2020.7
An efficient method for the bismuth‐catalyzed regioselective synthesis of pyranocoumarins and furocoumarins has been developed from the reaction of 4‐hydroxycoumarins with propargyl alcohols. The reaction proceeds through sequential propargylation and intramolecular cyclization reactions catalyzed by bismuth(III) triflate.
Alkynyl Borrowing: Silver-Catalyzed Amination of Secondary Propargylic Alcohols via C(sp<sup>3</sup>)–C(sp) Bond Cleavage
作者:Xin Zhuang、Min Zhu、Chuan-Ming Hong、Zhen Luo、Wan-Fang Li、Qing-Hua Li、Qun-Li Luo、Tang-Lin Liu
DOI:10.1021/acs.joc.2c00297
日期:2022.4.15
The silver-catalyzed alkynyl borrowing amination of secondary propargyl alcohols via C(sp3)–C(sp) bond cleavage has been developed. This new strategy was based on the β-alkynyl elimination of propargyl alcohols and alkynyl as the borrowing subject. This alkynyl borrowing amination featured high atom economy, wide functional group tolerance, and high efficiency.