Copper-Mediated Cyclization−Halogenation and Cyclization−Cyanation Reactions of β-Hydroxyalkynes and <i>o</i>-Alkynylphenols and Anilines
作者:Nalivela Kumara Swamy、Arife Yazici、Stephen G. Pyne
DOI:10.1021/jo1005119
日期:2010.5.21
The CuX (X = I, Br, Cl, CN)-mediated cyclization−halogenation and cyclization−cyanation reactions of β-hydroxyalkynes and o-alkynylphenol and -aniline derivatives give rise to 3-halo- and 3-cyanofuro[3,2-b]pyrroles, 3-iodo-, 3-bromo-, and 3-cyanobenzofurans, and 3-cyanoindoles, respectively.
CuX(X = I,Br,Cl,CN)介导的β-羟基炔烃与邻炔基苯酚和-苯胺衍生物的环化-卤化和环化-氰化反应生成3-卤代和3-氰基呋喃[3,2 - b ]吡咯,3-碘,3-溴-和3- cyanobenzofurans和3- cyanoindoles,分别。
Complex Annulations through Silver Carbenoid Intermediate: An Alternative Entry to Transformations of 1,2,3-Triazoles
作者:Yuan Yang、Jiang-Xi Yu、Xuan-Hui Ouyang、Jin-Heng Li
DOI:10.1021/acs.orglett.7b01682
日期:2017.8.4
transformations of N-sulfonyl-4-(2-(ethynyl)aryl)-1,2,3-triazoles with various generated in situ or external nucleophiles by means of silver catalysis for producing diverse functionalized isoquinolines is described. Mechanistically, the reaction is proposed to involve a key silver carbenoid intermediate, thus enabling the formation of multiple chemical bonds via ring opening, N2 extrusion, silver carbenoid
A novel and selective palladium-catalyzed carbonylative annulation process for the synthesis of 3-(halomethylene)indolin-2-ones was demonstrated. In the presence of PdX2 and CuX2, 3-(halomethylene)indolin-2-ones were selectively obtained from the carbonylative annulations of 2-(1-alkynyl)benzenamines with CO in moderate to good yields.
Syntheses of <i>N</i>-Alkyl 2-Arylindoles from Saturated Ketones and 2-Arylethynylanilines via Cu-Catalyzed Sequential Dehydrogenation/Aza-Michael Addition/Annulation Cascade
We describe here a Cu-catalyzed and 4-OH-TEMPO-mediated sequential dehydrogenation/aza-Michael addition/annulation cascade reaction for the construction of N-alkyl 2-arylindoles from facilely available saturatedketones and 2-arylethynylanilines. This reaction shows high regioselectivity and tolerates a variety of functional groups. Moreover, 3-alkyl-substituted indoles can also be achieved when using
A one-pot synthesis of 2,2′-disubstituted diindolylmethanes (DIMs) via a sequential Sonogashira coupling and cycloisomerization/C3-functionalization of 2-iodoanilines
作者:Anirban Kayet、Vinod K. Singh
DOI:10.1039/c7ob01701d
日期:——
A Pd(II)-Ag(I) catalyzed highly efficient synthesis of diindolylmethane has been developed. This transformation consists of a one pot sequential Sonogashira coupling (and desilylation) followed by cycloisomerization/C3-functionalization of 2‑iodoanilines. Six new bonds (four C-C and two C-N) are formed in one pot fashion. A variety of diindolylmethanes were obtained in excellent yields (up to 94%)