Studies on the transition metal-catalyzed synthesis of variously substituted (E)-3-[1-(aryl)methylidene]- and (E)-3-(1-alkylidene)-3H-furan-2-ones
作者:Renzo Rossi、Fabio Bellina、Chiara Bechini、Luisa Mannina、Piergiorgio Vergamini
DOI:10.1016/s0040-4020(97)10265-4
日期:1998.1
5-Aryl and 5-alkyl substituted (E)-3-[1-(aryl)methylidene]- and (E)-3-(1-alkylidene)-3H-furan-2-ones, (E)-9, have been selectively synthesized by cyclization of the corresponding (E)-2-(1-alkynyl)-3-aryl/alkylpropenoic acids, (E)-11, in the presence of AgNO3 or Pd-catalysts such as trans-di(μ-acetato)bis[(di-o-tolylphosphino)benzyl]dipalladium(II) or that constituted of a mixture of Et3N and PdCl2(PhCN)2
5-芳基和取代的5-烷基(É)-3- [1-(芳基)亚甲基] -和(ë)-3-(1-亚烷基)-3- ħ -呋喃-2-酮,(E) - 9在AgNO 3或Pd催化剂(例如反式-di )的存在下,通过环化相应的(E)-2-(1-炔基)-3-芳基/烷基丙酸(E)-11选择性合成(μ-乙酸根)双[(二- Ò -tolylphosphino)苄基]二钯(II),或构成的Et的混合物的3 N和的PdCl 2(PHCN)2或的PdCl 2(CH 3 CN)2。摩尔比分别为3∶1。代表性的(E)-5-芳基-3- [1-(芳基)亚甲基] -3H-呋喃-2-酮,即(E)-9i,也已经通过涉及Pd(O)的串联方法制备。 -和炔(1- )与(Z)-3-芳基-2-溴代丙酸之间的Cu(I)催化的交叉偶联反应,然后催化所得的交叉偶联产物的分子内氧化钯。但是,当使用相同的方法制备(E)-5-烷基-3- [1-(芳基)亚甲基]