Alcoholysis of Epoxides Catalyzed by Tetracyanoethylene and Dicyanoketene Acetals
作者:Yukio Masaki、Tsuyoshi Miura、Masahito Ochiai
DOI:10.1246/bcsj.69.195
日期:1996.1
A typical π-acid tetracyanoethylene and capto-dative olefin dicyanoketene acetals were found to catalyze stereospecific alcoholysis of epoxides at the ambient temperature to 50 °C in good yields. Mildness and significant chemoselectivity of the catalysts were demonstrated by intactness of tetrahydropyranyl ether and ethylene acetal groups. A novel regioselectivity associated with anchimeric assistance
发现典型的 π-酸四氰基乙烯和封端化烯烃双氰基烯酮缩醛在环境温度至 50°C 下以良好的产率催化环氧化物的立体定向醇解。四氢吡喃基醚和乙缩醛基团的完整性证明了催化剂的温和性和显着的化学选择性。在 1,2-二取代环氧化物的开环反应中观察到与侧链上醚基团的嵌合辅助相关的新区域选择性。