Bifunctional-Thiourea-Catalyzed Diastereo- and Enantioselective Aza-Henry Reaction
作者:Xuenong Xu、Tomihiro Furukawa、Tomotaka Okino、Hideto Miyabe、Yoshiji Takemoto
DOI:10.1002/chem.200500735
日期:2006.1
thiourea 1a catalyzes aza-Henry reaction of nitroalkanes with N-Boc-imines to give syn-beta-nitroamines with good to high diastereo- and enantioselectivity. Apart from the catalyst, the reaction requires no additional reagents such as a Lewis acid or a Lewis base. The N-protecting groups of the imines have a determining effect on the chirality of the products, that is, the reaction of N-Boc-imines gives
双官能硫脲1a催化硝基烷与N-Boc-亚胺的aza-Henry反应,生成具有良好至高非对映选择性和对映选择性的合成β-硝基胺。除了催化剂之外,该反应不需要其他试剂,例如路易斯酸或路易斯碱。亚胺的N-保护基对产物的手性有决定性影响,即N-Boc-亚胺的反应以R加合物为主要产物,而N-膦酰嘧啶的相同反应则提供了相应的S加合物。 。带有芳基,醇,醚和酯基的各种类型的硝基烷烃可以用作亲核试剂,以高收率和高对映体过量提供各种有用的手性结构单元。