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。