Catalytic Asymmetric Four-Component Reaction for the Rapid Construction of 3,3-Disubstituted 3‑Indol-3′-yloxindoles
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A Rh(II)/chiral phosphoric acid cocatalyzed four-component reaction of indoles, 3-diazooxindoles, arylamines, and ethyl glyoxylate is developed, offering an extremely efficient strategy for the construction of 3,3-disubstituted 3-indol-3′-yloxindoles with excellent diastereoselectivities and high to excellent enantioselectivities. This transformation is proposed to proceed through a Mannich-type trapping of the zwitterionic intermediate generated from a metal carbene and an indole with an iminoester derived from an arylamine and a glyoxylate.
创建时间：
2016-02-15
