Enol ethers are stereoselectively converted with 1,1-dicyanoalkenes into 1-alkoxy-2,2-dicyanocyclobutanes at 12 kbar pressure and temperatures up to 50°C. The main stereoisomer is mostly obtained pure in moderate to good yields by crystallization.
烯醇醚在12千巴压力和高达50°C的温度下,能选择性地与1,1-二
氰基烯反应生成1-烷氧基-2,2-二
氰基
环丁烷。通过结晶,主要立体异构体通常可以中等至良好的产率纯化获得。