Catalytic amount of lanthanoid(III) triflates promoted the conjugate addition of amines to 2-alkenoic acid esters to give β-amino esters. The reaction of benzylamine with α,β-unsaturated esters containing a stereogenic center at γ-position proceeded diastereoselectivity to yield optically active β-lactam precursors.
催化量的
镧系元素(III)
三氟甲磺酸酯促进胺与2-链烯酸酯的共轭加成,得到β-
氨基酯。
苄胺与 γ 位具有立构中心的 α,β-不饱和酯发生非对映选择性反应,生成光学活性的 β-内酰胺前体。