Asymmetric Synthesis of Spirocyclopentane Oxindoles Containing Four Consecutive Stereocenters and Quaternary α-Nitro Esters via Organocatalytic Enantioselective Michael-Michael Cascade Reactions

通过有机催化对映选择性 Michael-Michael 级联反应不对称合成含四个连续立体中心的螺环戊烷氧吲哚和季铵盐 α-硝基酯

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作者:Prakash D Chaudhari, Bor-Cherng Hong, Chao-Lin Wen, Gene-Hsiang Lee

Abstract

An enantioselective domino Michael-Michael reaction of nitroolefins and 2-nitro-3-arylacrylates has been established, which provided a series of spirocyclopentane oxindoles with four consecutive stereocenters including quaternary α-nitro esters with good yields (up to 73%) and excellent enantioselectivities (up to 97% ee). The reaction was realized and optimized with the aid of a chiral squaramide-amine catalyst. The structures of 11 products were confirmed by single-crystal X-ray diffraction analysis.

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