菲尔:梅德兰,诺埃莉亚·索莱达。Consejo Nacional de Investigaciones Cientificas y Tecnicas。Centro Cientifico Tecnologico Conicet - 罗萨里奥。Instituto de Quimica Rosario。罗萨里奥国立大学。Facultad de Ciencias Bioquimicas y Farmaceuticas。Instituto de Quimica Rosario;阿根廷
1a–c are shown to very efficiently catalyze the cycloisomerization of alkynoicacids into alkylidenelactones via metal–ligand cooperation (TON up to 2000). Complexes 1a–c are competent toward a broad range of alkynoicacids, including functionalized and internal ones, and give access to 5- as well as 6- and 7-membered lactones in excellent yields and with very high selectivities.