Rhodium-Catalyzed Tandem Cyclization: Formation of 1<i>H</i>-Indenes and 1-Alkylideneindans from Arylboronate Esters in Aqueous Media
作者:Mark Lautens、Tzvetelina Marquardt
DOI:10.1021/jo049722p
日期:2004.7.1
functionalized organorhodium intermediate which can cyclize onto nonterminal acetylenes in good to excellent yields. The catalytic system involves the use of electron-rich, sterically bulky ligands as tri-tert-butylphosphonium tetrafluoroborate stabilizing the organorhodium intermediates and reduces the incidence of protodeboronation in aqueous media.
Copper-Free Sonogashira Coupling Reaction with PdCl<sub>2</sub> in Water under Aerobic Conditions
作者:Bo Liang、Mingji Dai、Jiahua Chen、Zhen Yang
DOI:10.1021/jo048599z
日期:2005.1.1
A mild protocol for the copper-free Sonogashira coupling of aryl iodides with terminal acetylenes in water under aerobic conditions has been developed. The use of 1 mol % PdCl2 in the presence of pyrrolidine allows the coupling reaction to proceed at room temperature or 50 °C with good to excellent yields.
Microwave-Assisted Copper-Catalyzed Cross-Coupling Reaction of Alkynes with Aryl Iodides and Vinyl Halides
作者:Chin-Fa Lee、Wen-Ting Tsai、Yun-Yung Lin、Yu-Jen Wang
DOI:10.1055/s-0031-1290813
日期:2012.5
copper-catalyzed coupling of terminalalkynes with aryl iodides and vinyl halides is reported. In general, the reactions are completed in 10–30 min using 2–5 mol% [CuI(xantphos)] as a catalyst to provide the corresponding alkynes and enynes in good to excellent yields. A broad spectrum of aryl iodides, vinyl iodides, and bromides are coupled with aryl- and alkyl alkynes. The microwave-assisted, copper-catalyzed
Rhodium-Catalyzed Addition of Arylboronic Acids to Alkynyl Aza-Heteroaromatic Compounds in Water
作者:Mark Lautens、Masahiro Yoshida
DOI:10.1021/jo0205255
日期:2003.2.1
Alkynyl heteroaromatic compounds reacted with arylboronic acids to give addition products in the presence of a rhodium catalyst. The best results were obtained when a novel pyridine-substituted water-soluble phosphine ligand was used. The reactions proceed to give trisubstituted alkenes from various arylboronic acids and alkynyl heteroaromatic compounds with high regioselectivity. Only alkynes with
Copper-Catalyzed Highly Regio- and Stereoselective Directed Hydroboration of Unsymmetrical Internal Alkynes: Controlling Regioselectivity by Choice of Catalytic Species
Taking control of boron: A highly regio‐ and stereoselective copper‐catalyzedhydroboration of unsymmetrical internal alkynes has been developed. The regioselectivity was successfully controlled by the choice of catalytic species (copper hydride or boryl copper; see scheme).