Palladium-catalyzed cascade carboesterification of norbornene with alkynes
作者:Wanqing Wu、Can Li、Jianxiao Li、Huanfeng Jiang
DOI:10.1039/c8ob01799a
日期:——
An efficient and convenient palladium-catalyzed cascade carboesterification of norbornenes (NBE) with alkynes has been accomplished to afford functionalized α-methylene γ-lactone and tetrahydrofuran derivatives in good to excellent yields. This new strategy exhibits excellent atom- and step-economy, good functional group tolerance and broad substrate scope. In particular, NBE-palladium species was
Borane-catalyzed cascade Friedel–Crafts alkylation/[1,5]-hydride transfer/Mannich cyclization to afford tetrahydroquinolines
作者:Bei-Bei Zhang、Shuo Peng、Feiyi Wang、Cuifen Lu、Junqi Nie、Zuxing Chen、Guichun Yang、Chao Ma
DOI:10.1039/d1sc05629h
日期:——
An unprecedented redox-neutral annulation reaction of tertiary anilines with electron-deficient alkynes was developed that proceeds through a cascade Friedel–Crafts alkylation/[1,5]-hydride transfer/Mannich cyclization sequence. Under B(C6F5)3 catalysis, a range of functionalized 1,2,3,4-tetrahydroquinolines were facilely constructed in moderate to good yields with exclusive 3,4-anti-stereochemistry
[EN] CHALCOGENOPYRYLIUM DYES, COMPOSITIONS COMPRISING SAME, COMPOSITE NANOPARTICLES COMPRISING SAME, AND METHODS OF MAKING AND USING THE SAME<br/>[FR] COLORANTS À BASE DE CHALCOGÉNOPYRYLIUM, COMPOSITIONS LES COMPRENANT, NANOPARTICULES COMPOSITES LES COMPRENANT, PROCÉDÉS DE FABRICATION ET D'UTILISATION ASSOCIÉS
申请人:RES FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK UNIVERSITY AT BUFFALO
公开号:WO2016081813A1
公开(公告)日:2016-05-26
The present disclosure provides chalcogenopyrylium compounds, composite nanostructures comprising the chalcogenopyrylium compounds, and methods of using the compounds and/or composite nanostructures. For example, composite nanostructures comprising the chalcogenopyrylium compounds are used in imaging applications. The present disclosure provides chalcogenopyrylium compounds having the following structure where each E is, at each occurrence in the compound, independently charged or neutral and is independently selected from S, Se, 0, or Te, wherein at least one E is S or Se; each R1 is, at each occurrence in the compound, independently selected from the group consisting of -H, Ci-s alkyl group, halo group, -CN, aryl group, and heteroaryl group and adjacent R1 groups can combine to form C5ss aryl groups, each R2 is, at each occurrence in the compound.
Rhodium-Catalyzed Enantioselective Decarboxylative Alkynylation of Allenes with Arylpropiolic Acids
作者:Christian P. Grugel、Bernhard Breit
DOI:10.1021/acs.orglett.7b04035
日期:2018.2.16
A rhodium-catalyzed chemo-, regio-, and enantioselective intermolecular decarboxylative alkynylation of terminal allenes with arylpropiolic acids is reported. Employing a Rh(I)/(R)-Tol-BINAP catalytic system, branched allylic 1,4-enynes were obtained under mild conditions. The overall utility of this protocol is exemplified by a broad functional group compatibility.