Synthesis of 3-Alkynyl-2-(methylsulfanyl)benzo[b]furans via Sonogashira Cross-Coupling of 3-Iodo-2-(methylsulfanyl)benzo[b]furans with Terminal Alkynes
3-Alkynyl-2-(methylsulfanyl)benzo[b]furans were readily prepared under mild reaction conditions by palladium-catalyzed cross-coupling of 3-iodo-2-(methylsulfanyl)benzo[b]furans with a variety of terminalalkynes. The reaction was performed with propargyl alcohols, protected propargyl alcohols, as well as alkyl and aryl terminalalkynes. In addition, the 3-alkynylbenzo[b]furans obtained were readily transformed
通过钯催化的3-碘-2-(甲基硫烷基)苯并[ b ]呋喃与各种末端炔的交叉偶联,可以在温和的反应条件下轻松制备3-炔基-2-(甲基硫烷基)苯并[ b ]呋喃。该反应用炔丙醇,受保护的炔丙醇以及烷基和芳基末端炔烃进行。另外,使用氢碲化反应容易地将获得的3-炔基苯并[ b ]呋喃转化为更复杂的产物,这以良好的产率提供了所需的乙烯基碲化物。此外,使用铜催化的均偶联反应,我们能够以良好的收率将3-炔基苯并[ b ]呋喃转化为对称的二炔。 钯-Sonogashira交叉偶联-呋喃-炔烃-催化
Palladium catalyzed Suzuki cross-coupling of 3-iodo-2-(methylthio)-benzo[b]furan derivatives: synthesis of 3-aryl-2-(methylthio)benzo[b]furans
作者:Rafaela M Gay、Flávia Manarin、Ricardo Brandão、Gilson Zeni
DOI:10.1590/s0103-50532010000900006
日期:——
A selective and efficient method for the synthesis of 3-aryl-2-(methylthio)benzo[ b]furans derivatives by palladiumcatalyzed cross-coupling reaction with boronic acids has been developed. The reaction proceeded cleanly under mild conditions and was performed with aryl boronic acids bearing electron-withdrawing, electron donating and neutral substituents.
Electrophilic Cyclization of 2-Chalcogenealkynylanisoles: Versatile Access to 2-Chalcogen-benzo[<i>b</i>]furans
作者:Flávia Manarin、Juliano A. Roehrs、Rafaela Mozzaquatro Gay、Ricardo Brandão、Paulo H. Menezes、Cristina W. Nogueira、Gilson Zeni
DOI:10.1021/jo802736e
日期:2009.3.6
An efficient synthesis of 2-chalcogen-3-substituted-benzo[b]furan compounds has been accomplished via electrophilic cyclization reaction of 2-chalcogenealkynyl anisoles using I-2, ICl, Br-2 and PhSeBr as electrophile sources. The product distributions were strongly dependent on the nature of substituents in the aromatic ring of anisole and on the chalcogen atom directly bonded to the triple bond. The 2-chalcogen-3-iodo-benzo[b]furans obtained smoothly underwent conversion to more complex structures of benzo[b]furan derivatives via palladium- or copper-catalyzed cross-coupling reaction with thiols, diphenyl diselenides, and zincates.