Trisoxazoline/Cu(II)-Promoted Kinugasa Reaction. Enantioselective Synthesis of <i>β</i>-Lactams
作者:Meng-Chun Ye、Jian Zhou、Yong Tang
DOI:10.1021/jo0602874
日期:2006.4.1
precursor for the first time in the Kinugasa reaction, and this allowed the reaction to be performed under a practical and convenient condition. An appropriate base used in this reaction was essential to control both diastereoselectivity and enantioselectivity. Compared with primary and tertiary amines, secondary amines gave higher enantioselectivities. The reaction scope and limitation as well as the
手性i催化硝基酮与末端炔烃的反应Pr-三恶唑啉2a / Cu(ClO 4)2 ·6H 2在空气气氛下,以中等至良好的产率提供了高达85%ee的β-内酰胺。非对映选择性取决于炔烃。丙炔酸酯给出反式异构体作为主要产物,而其他炔烃主要提供顺式-二取代的内酰胺。在Kinugasa反应中,铜(II)盐首次被证明是有效的催化剂前体,这使得该反应可以在实用且方便的条件下进行。在该反应中使用的合适的碱对于控制非对映选择性和对映选择性都是必不可少的。与伯胺和叔胺相比,仲胺具有更高的对映选择性。研究了反应的范围和局限性及其机理。