在这项研究中,我们首次开发了一种有效的合成1,2-二氢喹啉和二氢苯并[ b ]氮杂衍生物的方法,该方法涉及氯化铁(III)的分子内炔烃-羰基复分解反应。在环境友好且廉价的氯化铁(III)(10 mol%)的存在下,在温和的条件下,由易于获得的底物制备了各种官能化的1,2-二氢喹啉和二氢苯并[ b ]氮杂s 。该方法适用于范围广泛的包含不同官能团的基材,并以高至优异的产率提供了装饰产品。该方法进一步扩展到一个一锅法合成的3-酰基喹啉通过通过添加NaOH / EtOH ,N-炔丙基-2-氨基苯甲醛/苯乙酮衍生物进行炔烃-羰基复分解/脱甲苯基化/芳构化。尽管对许多路易斯酸和布朗斯台德酸催化剂进行了研究,但无水氯化铁(III)却是该转化的最佳催化剂。
α,β-Functionalization of saturated ketones with anthranils via Cu-catalyzed sequential dehydrogenation/aza-Michael addition/annulation cascade reactions in one-pot
An efficient method to access functionalized quinolines from the readily available saturatedketones and anthranils have been explored. This one-pot cascade reaction involves the in situ generation of α,β-unsaturated ketones by the copper catalysed dehydrogenation of saturatedketones followed by the aza-Michael addition of anthranils and subsequent annulation.
Transition-Metal-Free Quinoline Synthesis from Acetophenones and Anthranils via Sequential One-Carbon Homologation/Conjugate Addition/Annulation Cascade
作者:Sandip Balasaheb Wakade、Dipak Kumar Tiwari、Pothapragada S. K. Prabhakar Ganesh、Mandalaparthi Phanindrudu、Pravin R. Likhar、Dharmendra Kumar Tiwari
DOI:10.1021/acs.orglett.7b02429
日期:2017.9.15
the construction of functionalized quinolines from readily available acetophenones and anthranils is reported. This one-pot reaction cascade involves in situ generation of α,β-unsaturated ketones from the acetophenone via one-carbon homologation by DMSO followed by the aza-Michael addition of anthranils and subsequent annulation. DMSO acted in this reaction not only as solvent but also as one carbon source
An efficient 3-acylquinoline synthesis from acetophenones and anthranil<i>via</i>C(sp<sup>3</sup>)–H bond activation mediated by Selectfluor
作者:Yejun Gao、Robert C. Hider、Yongmin Ma
DOI:10.1039/c9ra01481k
日期:——
method for the synthesis of 3-functionalized quinolines from commercially available acetophenones and anthranil has been described. Selectfluor propels the C(sp3)–H bond activation of the acetophenones and aza-Michael addition of anthranil resulting in annulated 3-acylquinolines in moderate to high yields. DMSO acts not only as a solvent but also as a one carbon donor in the reaction.
Regioselective three-component synthesis of 2,3-disubstituted quinolines <i>via</i> the enaminone modified Povarov reaction
作者:Yi Li、Xiaoji Cao、Yunyun Liu、Jie-Ping Wan
DOI:10.1039/c7ob02411h
日期:——
The regioselective construction of functionalized quinolines by the three-component reactions of enaminones, aldehydes and anilines is accomplished. Unlike conventional Povarov reactions employing terminal alkynes or alkenes as C3–C4 fragment sources which provide 2,4-disubstituted quinolines, the present method allows fast and regioselective formation of 2,3-disubstituted quinolines as a modified
Abstract A simple and straightforward protocol has been accomplished for synthesis of pyrazolo[3,4-b]pyridines by reacting 5-amino-1-phenyl-3-(trifluoromethyl)-1H-pyrazole-4-carbaldehyde (1) and β-enaminoketones (2) promoted by Iron(III)chloride. This protocol was also able to produce quinolines (5) by the reaction of O-nitrobenzaldehydes and β-enaminoketones. Simple reaction conditions, high compatibility