作者:Luca Bernardi、Francesco Fini、Raquel P. Herrera、Alfredo Ricci、Valentina Sgarzani
DOI:10.1016/j.tet.2005.09.076
日期:2006.1
The aza-Henry reaction of imines with nitromethane was promoted by cinchona alkaloids and modified cinchona bases to give optically active β-nitroamines. Various N-protected imines were examined as substrates. N-Boc, N-Cbz, and N-Fmoc protected imines gave the best results in terms of chemical yields and enantioselectivities. After a careful screening of a series of chiral bases, very good enantioselectivities
金鸡纳生物碱和修饰的金鸡纳碱可促进亚胺与硝基甲烷的aza-Henry反应,从而生成光学活性的β-硝胺。检查了各种N-保护的亚胺作为底物。ñ -Boc,ñ -Cbz和ñ -Fmoc保护亚胺的结果最好的化学产率和对映选择性的条款。在仔细筛选一系列手性碱后,使用金鸡纳基硫脲有机催化剂在优化的反应条件下获得了高达94%ee的良好对映选择性。