A New Copper(I)–Tetrahydrosalen-Catalyzed Asymmetric Henry Reaction and Its Extension to the Synthesis of (S)-Norphenylephrine
作者:Yan Xiong、Fei Wang、Xiao Huang、Yuehong Wen、Xiaoming Feng
DOI:10.1002/chem.200601262
日期:2007.1.12
A new chiral hydrogenated salen catalyst has been developed for the asymmetric Henry reaction which produces the expected products in moderate to high yields (up to 98 %) with excellent enantioselectivities (up to 96 % ee). A variety of aromatic, heteroaromatic, enal, and aliphatic aldehydes were found to be suitable substrates in the presence of hydrogenated salen 1 f (10 mol %), (CuOTf)(2)C(7)H(8)
已开发出一种用于不对称亨利反应的新型手性氢化塞伦催化剂,该催化剂能以中等至高产率(高达98%)产生预期的产物,并具有出色的对映选择性(高达96%ee)。发现存在氢化的salen 1f(10 mol%),(CuOTf)(2)C(7)H(8)(5 mol%)的情况下,各种芳香族,杂芳香族,烯醛和脂肪族醛都是合适的底物)和4 A分子筛。该方法是耐空气的,并且容易使用容易获得的试剂进行操作,并且已经成功地扩展到以商业上可得的间羟基苯甲醛为原料,以67%的总产率合成(S)-去氧肾上腺素。根据实验研究和MM +计算,