An Improved Environmentally Friendly Approach to 4-Nitro-, 4-Sulfonyl-, and 4-Aminoquinolines and 4-Quinolones through Conjugate Addition of Nucleophiles to β-(2-Aminophenyl)-α,β-ynones
led to valuable 4-sulfonylquinolines and 4-nitroquinolines. The latter proved to be versatile precursors of N-unsubstituted 4-aminoquinolines and 4-quinolones. Reaction of β-(2-aminophenyl)-α,β-ynones with DMF/NaOH resulted in the formation of 4-(dimethylamino)quinolines. The use of an alternative CO-free procedure for the preparation of substrates β-(2-aminophenyl)-α,β-ynones allowed extension of the
TBAF‐Catalyzed Tandem Synthesis of Triazolo[4,5‐
<i>c</i>
]quinolines at Ambient Temperature
作者:Nan Sun、Han Yang、Kai Zheng、Liqun Jin、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1002/ejoc.202001280
日期:2020.11.22
1H‐[1,2,3]triazolo[4,5‐c]quinolines have been developed based on tandem TBAF‐catalyzed intermolecular azide‐alkyne [3+2] cycloaddition of β‐(2‐aminoaryl)‐α,β‐ynones and TMS‐N3, followed by intramolecular dehydration annulation reaction. This transformation can smoothly proceed at ambient temperature to provide a broad range of functionalized 1H‐[1,2,3]triazolo[4,5‐c]quinolines in up to 95 % yield in
基于串联TBAF催化的分子间叠氮化物-炔烃[3 + 2]环加β-(),开发了一种高效且无金属的1 H- [1,2,3]三唑并[4,5- c ]喹啉。 2-氨基芳基)-α,β-炔酮和TMS-N 3,然后进行分子内脱水环化反应。这种转化可以在环境温度下平稳地进行,以提供32个实例中高达95%的收率的多种功能化1 H- [1,2,3]三唑[4,5- c ]喹啉。
Experimental results and computational insight into sequential reactions of β-(2-aminophenyl)-α,β-ynones with aryl isocyanates/benzoyl isothiocyanate
addition/cyclization reactions of β-(2-aminophenyl)-α,β-ynones with arylisocyanates/benzoyl isothiocyanate is reported. Experimental results show the suitable conditions to selectively direct the reaction outcome towards the product of 6-exo-dig N-, O-, or S-annulation of the in situ generated alkynyl urea/thiourea intermediate. The reaction of a variety of β-(2-aminophenyl)-α,β-ynones with arylisocyanates/benzoyl
Reaction of β-(2-aminophenyl)-α,β-Ynones with Tosyl Isocyanate: Experimental and Computational Investigations
作者:Navnath D. Rode、Massimiliano Aschi、Marco Chiarini、Luana Del Vecchio、Fabio Marinelli、Antonio Arcadi
DOI:10.1002/adsc.201800733
日期:2018.10.4
A practical metal‐free approach to the synthesis of 2‐aroyl‐N‐tosyl‐1H‐indole‐3 carboxamides through an unprecedented sequential 5‐endo‐dig cycloamination /carboxamidation reaction of β‐(2‐aminophenyl)‐α,β‐ynones with the tosyl isocyanate is described. A computational model gives a plausible rationale for the unexpected results.
β-(2-aminophenyl)-α,β-ynones can quickly give functionalized 2,4-disubstituted quinolines through tandem nucleophic addition/annulations reactions. Acid-catalysed cyclization of β-(2-aminophenyl)-α, β-ynones can also occur. The easy entry into 4-iodo-2-substituted-quinolines prompted the development of a one pot procedure for synthesis of 2,4-disubstituted quinolines by further elaboration by means