A general organic catalyst for asymmetric addition of stabilized nucleophiles to acyl imines
作者:Christiane M. Bode、Amal Ting、Scott E. Schaus
DOI:10.1016/j.tet.2006.07.071
日期:2006.12
Cinchona alkaloid-derived thiourea catalysts promote nucleophilic additions to acyl imines for the asymmetric synthesis of secondary amine adducts. The hydroquinine-derived thiourea catalyst efficiently promotes the aza-Henry reaction of nitroalkane with acyl imines, affording β-nitroamines in good yields with enantioselectivities of 90–98% ee and diastereoselectivities up to 97%. The scope of the
金鸡纳生物碱衍生的硫脲催化剂可促进酰基亚胺的亲核加成反应,从而实现仲胺加合物的不对称合成。对苯二酚衍生的硫脲催化剂可有效促进硝基烷与酰基亚胺的aza-Henry反应,提供高收率的β-硝胺,对映选择性为90-98%ee,非对映选择性高达97%。反应范围还包括丙二酸二甲酯作为亲核试剂,以高对映体纯度获得β-氨基酯。在优化的反应条件下,基于各种芳族和α,β-不饱和酰基亚胺生成高对映体纯度的仲胺加合物。