One-pot synthesis of 2,4-disubstituted quinolines via silver-catalyzed three-component cascade annulation of amines, alkyne esters and terminal alkynes
作者:Yunlan Li、Qiurui Zhang、Xuefeng Xu、Xu Zhang、Yurong Yang、Wei Yi
DOI:10.1016/j.tetlet.2019.03.003
日期:2019.4
Described herein is a new and general method for one-pot synthesis of 2,4-disubstituted quinolines via silver-catalyzed [3 + 1 + 2] annulation of simple amines, alkyne esters and terminal alkynes. The versatile transformation might initiate with the facile formation of the enamine species with the feature of good to excellent yields, exclusive regioselectivity, and excellent substrate/functional group
Electrochemical Synthesis of 1-Naphthols by Intermolecular Annulation of Alkynes with 1,3-Dicarbonyl Compounds
作者:Mu-Xue He、Zu-Yu Mo、Zi-Qiang Wang、Shi-Yan Cheng、Ren-Ren Xie、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1021/acs.orglett.9b04549
日期:2020.1.17
functionalized 1-naphthols using alkynes and 1,3-dicarbonylcompounds by (4 + 2) annulation of C-centered radical. Electrolysis was conducted with Cp2Fe as redox catalyst, thereby eliminating the use of oxidants and transition-metal catalysts. The synthesized 1-naphthol compounds showed good antitumor activity in vitro, and further studies indicated that compound 3bl induced tumor cell apoptosis.
Oxidative Cycloaddition of 1,1,3,3-Tetramethyldisiloxane to Alkynes Catalyzed by Supported Gold Nanoparticles
作者:Ioannis N. Lykakis、Androniki Psyllaki、Manolis Stratakis
DOI:10.1021/ja2045502
日期:2011.7.13
nanoparticles supported on TiO(2) (0.1-1% mol) catalyze at roomtemperature and at extremely mild conditions the unprecedented oxidative cycloaddition of 1,1,3,3-tetramethyldisiloxane to alkynes, forming substituted 2,5-dihydro-1,2,5-oxadisiloles, with concomitant evolution of hydrogen gas. For the majority of the substrates, the yields are exceptional (up to 99%). The reaction proceeds at room temperature
Divergent Synthesis of Quinolones and Dihydroepindolidiones via Cu(I)-Catalyzed Cyclization of Anilines with Alkynes
作者:Xuefeng Xu、Ruzhong Sun、Sheng Zhang、Xu Zhang、Wei Yi
DOI:10.1021/acs.orglett.8b00436
日期:2018.4.6
A unique and efficient method for one-pot synthesis of diverse 4-quinolones from simple and readily available primary anilines and alkynes viaCu(I)-catalyzed direct cyclization has been developed. The (thio)phenols were also found to visible substrates for this reaction. Moreover, an unprecedented synthesis of dihydroepindolidiones has been demonstrated by using secondary anilines as the versatile
La(OTf)<sub>3</sub> catalyzed reaction of salicylaldehyde phenylhydrazones with β-ketoesters and activated alkynes: facile approach for the preparation of chromenopyrazolones
作者:Kurma Siva Hariprasad、Kasagani Veera Prasad、Bhimapaka China Raju
DOI:10.1039/c6ra21717f
日期:——
A facile approach has been developed for the preparation of chromenopyrazolones (5a–o, 7a–k) by the reaction of salicylaldehyde phenylhydrazones (3a–o) with β-ketoesters (4a, 4f–g) and activated alkynes (6a–e) in the presence of La(OTf)3 with good yields. However, the reaction of salicylaldehyde phenylhydrazones (3a, 3c, 3j–k, 3n) with ethyl 4-chloro-3-oxobutanoate (4e) underwent cyclization with reductive