Pd(II)-Catalyzed Asymmetric Addition of Arylboronic Acids to Isatin-Derived Ketimines
摘要:
A Pd(II)/Pyrox-catalyzed enantioselecitve addition of arylboronic acids to 3-ketimino oxindoles was developed, providing chiral 3-amino-2-oxindoles with a quaternary stereocenter in high yields and with good enantioselectivities. A variety of functionalized 3-ketimino oxindoles can be used, and the method tolerates some variation in arylboronic acid scope. This asymmetric arylation provides an alternative efficient catalytic method for the preparation of chiral 3-aryl-3-amino-2-oxindoles, which also represents the first example of a Pd(II)-catalyzed addition of arylborons to exocyclic ketimines.
描述了在催化量的手性全氢-1,3-苯并恶嗪存在下,在温和的反应条件下使用末端炔烃和 Me 2 Zn对靛红和靛红衍生的酮亚胺进行对映选择性炔基化的通用方案,具有中等至优异的对映选择性。酮亚胺的添加提供了一种将手性胺作为羟吲哚衍生物的新方法。对于芳基和烷基取代的末端炔烃和靛红衍生物,该反应的范围很广。在靛红中,炔基化发生在羰基的Si面,而在酮亚胺衍生物中,它发生在亚胺的Re面。
A Pd(II)/Pyrox-catalyzed enantioselecitve addition of arylboronic acids to 3-ketimino oxindoles was developed, providing chiral 3-amino-2-oxindoles with a quaternary stereocenter in high yields and with good enantioselectivities. A variety of functionalized 3-ketimino oxindoles can be used, and the method tolerates some variation in arylboronic acid scope. This asymmetric arylation provides an alternative efficient catalytic method for the preparation of chiral 3-aryl-3-amino-2-oxindoles, which also represents the first example of a Pd(II)-catalyzed addition of arylborons to exocyclic ketimines.
Enantioselective synthesis of 3-hydroxy- and 3-amino-3-alkynyl-2-oxindoles by the dimethylzinc-mediated addition of terminal alkynes to isatins and isatin-derived ketimines
作者:Elena Prieto、Jorge D. Martín、Javier Nieto、Celia Andrés
DOI:10.1039/d3ob01023f
日期:——
protocol for enantioselective alkynylation of isatins and isatin-derived ketimines using terminal alkynes and Me2Zn in the presence of a catalytic amount of a chiral perhydro-1,3-benzoxazine with moderate to excellent enantioselectivity under mild reaction conditions is described. The additions to ketimines present a novel approach to chiral amines being derivatives of oxindoles. The reaction is broad
描述了在催化量的手性全氢-1,3-苯并恶嗪存在下,在温和的反应条件下使用末端炔烃和 Me 2 Zn对靛红和靛红衍生的酮亚胺进行对映选择性炔基化的通用方案,具有中等至优异的对映选择性。酮亚胺的添加提供了一种将手性胺作为羟吲哚衍生物的新方法。对于芳基和烷基取代的末端炔烃和靛红衍生物,该反应的范围很广。在靛红中,炔基化发生在羰基的Si面,而在酮亚胺衍生物中,它发生在亚胺的Re面。