A highly efficient rhodium(I) and iridium(I) catalysed dihydroalkoxylation reaction of alkyne diols is employed here for the synthesis of spiroketals and a fused bicyclic ketal. The two metal catalysts show differential selectivity and efficiency for either the cyclisation of the 5-exo or 6-endo-membered rings. For the first time, a dual metal (Rh and Ir) catalyst system is effectively utilised for
炔二醇的高效
铑(I)和
铱(I)催化的二氢烷氧基化反应在此用于
螺环酮和稠合的双环
缩酮的合成。两个
金属催化剂显示出对5-任环化差的选择性和效率外或6-内-元环。第一次,双重
金属(
铑 和
铱)催化剂体系可有效地用于形成5,6-螺酮,比单一
金属催化剂更有效。与等效的单一催化剂相比,两种不同的
金属产生了双重活化途径,从而增强了5元和6元环的闭合性。