Preparation of benzo[b]thiophenes by Pd(0)-catalyzed intramolecular cyclization of allyl (and propargyl) o-iodophenyl sulfides.
作者:Narcís Arnau、Marcial Moreno-Mañas、Roser Pleixats
DOI:10.1016/s0040-4020(01)80255-6
日期:1993.1
Benzo[b]thiophenes are prepared by intramolecular Pd(0)-catalyzed Heck reaction of allyl o-iodophenyl sulfides. Pd(0)-Catalyzed intramolecular cyclization of o-iodophenyl propargyl sulfide in the presence of a hydride donor gives 3-methylene-2,3-dihydrobenzo[b]thiophene, which reacts with several enophiles in ene type reactions. However, allyl (and propargyl) aryl sulfides react with palladium(II) chloride to afford
苯并[b]噻吩是通过分子内Pd(0)催化的烯丙基邻碘苯硫醚的Heck反应制备的。在氢化物供体的存在下,Pd(0)催化邻碘苯基炔丙基硫的分子内环化反应生成3-亚甲基-2,3-二氢苯并[b]噻吩,该苯并噻吩在烯型反应中与数个亲烯体反应。但是,烯丙基(和炔丙基)芳基硫醚与氯化钯(II)反应,得到聚合的[PdCl(SAr)] 2。