作者:Christoph Schneider、Jörg Brauner
DOI:10.1002/1099-0690(200112)2001:23<4445::aid-ejoc4445>3.0.co;2-u
日期:2001.12
A novel concept for catalytic epoxide alkylation has been developed. Lewis bases like phosphanes, arsanes, stibanes, and sulfides were found to catalyze the alkylation of symmetrical epoxides with trialkylaluminum compounds very effectively at a 5 mol % level. Cyclic as well as acyclic epoxides were readily alkylated in good yields. In reactions with terminal epoxides a significant enhancement of rate
已经开发了催化环氧化物烷基化的新概念。发现路易斯碱(如磷烷、砷烷、锑和硫化物)在 5 mol% 的水平下非常有效地催化对称环氧化物与三烷基铝化合物的烷基化。环状和无环环氧化物很容易以良好的产率烷基化。在与末端环氧化物的反应中,在路易斯碱催化过程中注意到速率和/或区域选择性的显着提高。路易斯碱与路易斯酸性铝试剂的配位由 27 Al 和 31 P NMR 光谱证明,并建议形成更亲核的烷基化剂。