Synthesis, Characterization and Application of Some Axially Chiral Binaphthyl Phosphoric Acids in Asymmetric Mannich Reaction
作者:Yuanyong Yao、Hua Shu、Bangcheng Tang、Shixue Chen、Zhongying Lu、Wei Xue
DOI:10.1002/cjoc.201500017
日期:2015.5
Two novel chiral Br?nsted acids 3b and 3c were prepared without involving the complexity of Suzuki coupling. Catalyst 3c bearing two additional hydroxyl groups at 3 and 3′ positions of axially chiral 1,1‐binaphthalene‐2,2′‐diol phosphoric acid was applied in a model Mannich reaction to afford β‐amino ester in high yield (92%) and enantiomeric excess (91%) at low reacting temperature of −40°C. In addition
在不涉及铃木偶联复杂性的情况下,制备了两种新颖的手性Br 2 Nsted酸3b和3c。在模型Mannich反应中使用了在轴向手性1,1-双萘-2,2'-二醇磷酸的3和3'位置带有两个额外羟基的催化剂3c,以高收率(92%)获得β-氨基酯在−40°C的低反应温度下,对映体过量(91%)。另外,在上述条件下,在催化剂3c的存在下获得了具有高收率和优异的对映选择性的那些β-氨基酯衍生物。