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Assembly of Indolenines, 3‑Amino Oxindoles, and Aldehydes into Indolenine-Substituted Spiro[pyrrolidin-2,3′-oxindoles] via 1,3-Dipolar Cycloaddition with Divergent Diastereoselectivities

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journal contribution
posted on 29.03.2017, 00:00 by Guodong Zhu, Siyuan Liu, Shiqi Wu, Lianghong Peng, Jingping Qu, Baomin Wang
A novel one-pot 1,3-dipolar cycloaddition of indolenines, 3-aminooxindoles, and aldehydes is reported. The reaction provides indolenine-substituted spiro­[pyrrolidin-2,3′-oxindoles] containing four contiguous stereogenic centers in high yields (up to 99%) and excellent diastereoselectivities (up to >20:1 dr) under mild conditions. Remarkably, the inversion of diastereoselectivity could be readily achieved through slightly modifying the reaction conditions.