An efficient organocatalytic cascade reaction has been developed involving a Michael-hemiaminalization relay for the asymmetric synthesis of spiropiperidinone derivatives : bearing adjacent quaternary and tertiary chiral centers via LUMO or HOMO activation. Importantly, this methodology demonstrates that applying distinct activation modes to different substrates in the same reaction can diverge diastereoselectivity. To our knowledge, this is also one of the few published cases of primary amine catalytic [3 + 3] cycloaddition reactions involving alpha-branched beta-ketoamides.
Citation： Li Xiang, Huang Wei, Liu Yan-Qing, Kang Jing-Wen, Xia Dan, He Gu, Peng Cheng, Han Bo. Control of Activation Mode To Achieve Diastereodivergence in Asymmetric Syntheses of Chiral Spiropiperidinone Derivatives. West China medical Virtual Journal, 2000, 1(1): 397-406-. doi: 10.1021/acs.joc.6b02489 Copy
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