Synthesis of Highly Substituted Furans by the Electrophile-Induced Coupling of 2-(1-Alkynyl)-2-alken-1-ones and Nucleophiles
作者:Tuanli Yao、Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/jo0510585
日期:2005.9.1
induced by an electrophile, provides highlysubstitutedfurans in good to excellent yields under very mild reaction conditions. Various nucleophiles, including functionally substitutedalcohols, H2O, carboxylic acids, 1,3-diketones, and electron-rich arenes, and a range of cyclic and acyclic 2-(1-alkynyl)-2-alken-1-ones readily participate in these cyclizations. Iodine, NIS, and PhSeCl have proven
Synthesis of trisubstituted furans via Ag-catalyzed cascade heterocyclization of 2-(1-alkynyl)-2-alken-1-ones with aryl-amines
作者:Ting He、Yaling Chi、Yuantao Chen
DOI:10.1007/s11696-017-0323-4
日期:2018.3
A silver(I)-catalyzed cascade heterocyclization of 2-(1-alkynyl)-2-alken-1-ones with aryl-amines is described to synthesize trisubstituted furans in moderate to good yields. Tertiary amine is also efficient in this reaction. This transformation proceeds smoothly with the formation of C–N or C–C bonds in one-pot with good functional group tolerance under mild conditions.
New access to allenes: With photocatalytic reductive radical-polar crossover as the strategy, a new protocol for the preparation of trisubstituted allenes has been nicely developed via the reactions of 1,3-enynes with various alkyl radicals.
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。
Organocatalytic Formation of Chiral Trisubstituted Allenes and Chiral Furan Derivatives
作者:Pernille H. Poulsen、Yang Li、Vibeke H. Lauridsen、Danny K. B. Jørgensen、Teresa A. Palazzo、Marta Meazza、Karl Anker Jørgensen
DOI:10.1002/anie.201806238
日期:2018.8.13
by amino catalytic activation of either aldehydes or α,β‐unsaturated aldehydes for reaction with alkynyl‐substituted enones is presented. The reaction forms a variety of trisubstituted allenes in high yields and with excellent stereoselectivities. The utility of the reaction concept is demonstrated by the synthesis of chiral furan derivatives in high yields and stereoselectivities.