Extrapolation of the gold-catalyzed cycloisomerization to the palladium-catalyzed cross-coupling/cycloisomerization of acetylenic alcohols for the synthesis of polysubstituted furans: Scope and application to tandem processes
作者:Chandrasekar Praveen、Paramasivan T. Perumal
DOI:10.1016/s1872-2067(15)60994-9
日期:2016.2
of diverse furan derivatives from acetylenic alcohols by gold and palladium catalyzed π-activation chemistry. Notably, this new method was found to be amenable to cyclooctyl-containing substrates, which represents a significant extension to this methodology compared with our previous reports. Furthermore, this newly developed method allowed for the direct construction of cyclooctyl furans from their
Lewis Acid Promoted Oxonium Ion Driven Carboamination of Alkynes for the Synthesis of 4-Alkoxy Quinolines
作者:Santosh J. Gharpure、Santosh K. Nanda、Priyanka A. Adate、Yogesh G. Shelke
DOI:10.1021/acs.joc.6b02896
日期:2017.2.17
Lewis acid mediated multisegment coupling cascade is designed for the synthesis of densely substituted 4-alkoxy quinolines via an oxonium ion triggered alkyne carboamination sequence involving C–C and C–N bond formations. Cyclic ether fused-quinolines could also be accessed using this fast, operationally simple, high yielding, chemoselective and functional group tolerant method. Versatility and utility
Gold-Catalyzed Concomitant [3 + 3] Cycloaddition/Cascade Heterocyclization of Enynones/Enynals with Azides Leading to Furanotriazines
作者:A. Leela Siva Kumari、K. C. Kumara Swamy
DOI:10.1021/acs.joc.5b02567
日期:2016.2.19
[Au]-catalyzed [3 + 3] cycloaddition reaction of enynones/enynals with azides, which allows the efficient regioselective synthesis of highly fused furo[3,4-d][1,2,3]triazines in good-to-excellent yields under mild conditions, has been developed. The syntheticutility of furanotriazines was exploited by oxidation with cerium ammonium nitrate (CAN) affording highly functionalized dihydrotriazines. Both
乙炔/烯醛与叠氮化物的[Au]催化的[3 + 3]环加成反应,可在良好或优异的条件下有效地选择性合成高度熔融的呋喃[3,4- d ] [1,2,3]三嗪已经开发了在温和条件下的产量。通过用硝酸铈铵(CAN)氧化来开发呋喃三嗪的合成效用,从而提供高度官能化的二氢三嗪。呋喃[3,4- d ] [1,2,3]三嗪和二氢三嗪均显示出良好的荧光活性。
Metal-free Hydroalkoxylation-Formal [4+2] Cycloaddition Cascade for the Synthesis of Ketals
作者:Santosh J. Gharpure、Santosh K. Nanda、Padmaja、Yogesh G. Shelke
DOI:10.1002/chem.201701659
日期:2017.7.26
A transition metalfree, acid promoted cascade hydroalkoxylation–formal [4+2] cycloaddition of various alkynols with salicylaldehyde is demonstrated for the synthesis of tetrahydrofurano/pyrano‐chromenes and spiroketals. In general, alkynols underwent hydroalkoxylations in an endo‐dig manner when internal alkynes were used to furnish the heteroannular ketals, whereas terminal alkynes proceeded in an
3,3′-Bis(arylbenzofurans) via a Gold-Catalyzed Domino Process
作者:Hermann Wegner、Mathieu Auzias、Markus Neuburger
DOI:10.1055/s-0030-1258566
日期:2010.10
A new heterogeneous gold-catalyzed system for the dominocyclizationoxidativecoupling of 2-alkynyl phenols for the formation of 3,3`-bisbenzofurans was developed. The substrate and the catalyst scope as well as the reaction conditions were investigated and optimized. This method provides access to this novel structural theme in two steps starting from commercially available chemicals. The molecular