作者:A.I. Meyers、Mary Ann Hanagan、L.M. Trefonas、R.J. Baker
DOI:10.1016/s0040-4020(01)91917-9
日期:1983.1
Chiral aromatic oxazolines were prepared for utilization in asymmetric C-C bonding reactions. Lithiation of aryloxazolines could not be accomplished directly but were efficiently lithiated via halogen metal exchange of the o-bromo derivative 16. The resulting lithio compound 9 reacted smoothly with carbonyls to give adducts 19 but with poor stereoselectivity. Hydrolysis gave the phthalides 4 in poor
制备了用于不对称CC键合反应的手性芳族恶唑啉。芳基恶唑啉的锂化不能直接完成,而是通过邻溴衍生物16的卤素金属交换有效地被锂化。所得的硫代化合物9与羰基平稳反应,得到加合物19,但立体选择性差。水解得到的邻苯二甲酸酯4的ee较差(20–25%)。当将硫代恶唑啉9转化为21时,它们现在用作手性亲电子试剂。在21中添加有机金属尤其在格利雅试剂的帮助下,得到了有用水平的不对称诱导,水解后,得到的邻苯二甲酸盐含量为40-80%ee(4)。