Phosphite-Gold(I)-Catalyzed [2+2] Intermolecular Cycloaddition of Enol Ethers with N-Allenylsulfonamides
作者:Samuel Suárez-Pantiga、Cristina Hernández-Díaz、María Piedrafita、Eduardo Rubio、José M. González
DOI:10.1002/adsc.201200043
日期:2012.6.18
Addition of catalytic amounts of a phosphite‐based gold(I) catalyst efficiently triggers the intermolecular [2+2] cycloaddition of allenes and alkenes substituted by electron‐donor groups. The reaction is fast and furnishes cyclobutane derivatives in a stereoselective manner using low catalyst loadings. Besides, the same catalyst selectively affords homodimerization products from the starting allene
Formal Intermolecular [2 + 2] Cycloaddition Reaction of Alleneamides with Alkenes via Gold Catalysis
作者:Xiao-Xiao Li、Li-Li Zhu、Wen Zhou、Zili Chen
DOI:10.1021/ol202703a
日期:2012.1.20
An efficient method was developed to construct the densely functionalized cyclobuane adducts through formal intermolecular cycloaddition of alleneamides with electron-rich olefins via gold catalysis, in which vinyl ethers/amides and electron-rich styrenes worked very well. In addition, a series of alleneamide dimerization products were prepared from the same alleneamide substrates.