Efficient Synthesis of Benzothiophenes by an Unusual Palladium-Catalyzed Vinylic CS Coupling
作者:Christopher S. Bryan、Julia A. Braunger、Mark Lautens
DOI:10.1002/anie.200902843
日期:2009.9.7
construction of a CS and a CC bond under catalytic conditions forms the basis of an efficient route to diversely functionalized benzothiophenes from gem‐dihalovinyl thiophenols. The CC bond can be formed in this tandem catalytic process with an organoboron reagent as shown in the scheme (R1=H, Me, F, Cl, Br, OCH2O; R2=H, Me; R3=aryl, heteroaryl, alkenyl, alkyl), or by Heck or Sonogashira coupling with an
同时施工一个C S和一个C 催化条件下C键形成从不同地官能化的苯并噻吩的高效路由的基础宝石-dihalovinyl苯硫酚。与c 可以在此串联与有机硼试剂催化工艺来形成C键为显示在方案(R 1 = H中,Me,F,氯,溴, OCH 2 ö ; R 2 = H中,Me; R 3=芳基,杂芳基,烯基,烷基),或通过Heck或Sonogashira与烯烃或炔烃偶联。
UVA Light‐promoted Catalyst‐free Cyclization of Vinyl Selenides: Green and Efficient Synthesis of C3‐Unsubstituted 2‐Selanyl Benzochalcogenophenes
作者:Gelson Perin、Thiago J. Peglow、Filipe Penteado、Patrick C. Nobre、Krigor B. Silva、Guilherme Stach、Thiago Barcellos、Eder J. Lenardão、Juliano A. Roehrs
DOI:10.1002/asia.202101394
日期:2022.4.14
An environmentally friendly protocol to prepare selenium-containing benzo[b]chalcogenophenes by photocyclization of o-chalcogen-substituted selanylalkenes using UVA irradiation is presented.