Synthesis of Substituted Quinolines by Electrophilic Cyclization of <i>N</i>-(2-Alkynyl)anilines
作者:Xiaoxia Zhang、Marino A. Campo、Tuanli Yao、Richard C. Larock
DOI:10.1021/ol0476218
日期:2005.3.1
Quinolines substituted in the 3-position by an iodo or phenylseleno group are readily prepared in good to excellent yields by the reaction of propargylic anilines with appropriate electrophiles under mild reaction conditions. [reaction: see text]
Synthesis of substituted quinolines by the electrophilic cyclization of n-(2-alkynyl)anilines
作者:Xiaoxia Zhang、Tuanli Yao、Marino A. Campo、Richard C. Larock
DOI:10.1016/j.tet.2009.12.012
日期:2010.2
A wide variety of substituted quinolines are readily synthesized under mild reaction conditions by the 6-endo-dig electrophilic cyclization of N-(2-alkynyl)anilines by ICl, I2, Br2, PhSeBr, and p-O2NC6H4SCl. The reaction affords 3-halogen-, selenium- and sulfur-containing quinolines in moderate to good yields in the presence of various functional groups. Analogous quinolines bearing a hydrogen in the
Lanthanide‐catalyzed alkynyl exchange through C−C single‐bondcleavage assisted by a secondary amino group is reported. A lanthanide amido complex is proposed as a key intermediate, which undergoes unprecedented reversible β‐alkynyl elimination followed by alkynyl exchange and imine reinsertion. The in situ homo‐ and cross‐dimerization of the liberated alkyne can serve as an additional driving force
Efficient and robust superparamagnetic copper ferrite nanoparticle-catalyzed sequential methylation and C–H activation: aldehyde-free propargylamine synthesis
作者:Anh T. Nguyen、Lam T. Pham、Nam T. S. Phan、Thanh Truong
DOI:10.1039/c4cy00753k
日期:——
for oxidative cross-couplingreactions between N-alkyl anilines and terminal alkynes forming N-aryl-N-methylpropargylamines. Superparamagnetic CuFe2O4 nanoparticles were employed as efficient and robust catalyst. The optimum conditions involved the use of tert-butyl hydroperoxide (TBHP) as oxidant and methylating reagent in dimethylacetamide (DMA) solvent at 140 °C. The two-step reaction, methylation
我们已经描述了用于氧化之间的交叉偶联反应的方法Ñ形成烷基苯胺和末端炔烃ñ -芳基- Ñ -methylpropargylamines。超顺磁性CuFe 2 O 4纳米颗粒被用作高效且坚固的催化剂。最佳条件包括在140°C下在二甲基乙酰胺(DMA)溶剂中使用氢过氧化叔丁基(TBHP)作为氧化剂和甲基化试剂。甲基化和C-C交叉偶联两步反应可高效进行且具有高选择性,并且可在较短的反应时间内获得良好的转化率。进行了初步的机械研究。铜铁2 O 4 可以通过磁倾析法将纳米颗粒轻松地从反应混合物中分离出来,并且可以重复使用几次,而催化活性只会略有下降。
Synthesis of spiro-4<i>H</i>-pyrazole-oxindoles and fused 1<i>H</i>-pyrazoles <i>via</i> divergent, thermally induced tandem cyclization/migration of alkyne-tethered diazo compounds
A thermally induced, substrate-dependent reaction of alkynyl diazocompounds has been developed. This transformation produces spiro-4H-pyrazole-oxindoles and fused 1H-pyrazoles in good to high yields from the corresponding alpha-cyano and alpha-sulfonyl diazocompounds. The salient features of this reaction include excellent chemoselectivity and atom-economy, mild reaction conditions, simple purification