Kitzinger Katelyn M, Giordano Mitchell T, de Jesús Cruz Pedro, Johnson Jeffrey S
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States.
J Org Chem. 2024 Apr 19;89(8):5878-5882. doi: 10.1021/acs.joc.4c00157. Epub 2024 Mar 19.
Michael-aldol domino reactions are powerful tools for rapidly assembling carbocyclic scaffolds. We herein disclose a base-catalyzed Michael-aldol domino reaction of trisubstituted Michael acceptors with β-keto ester nucleophiles. The cyclohexanone products are obtained in excellent diastereoselectivity (up to >20:1 dr) and good yields (up to 84%). An attractive practical consideration is that pure products are isolated directly via filtration of the unpurified reaction mixtures. Further functionalization of the cyclohexanones is achieved without perturbation of stereocenters installed through the preceding annulation.
迈克尔-羟醛串联反应是快速构建碳环骨架的有力工具。我们在此披露一种三取代迈克尔受体与β-酮酯亲核试剂的碱催化迈克尔-羟醛串联反应。环己酮产物以优异的非对映选择性(高达>20:1的dr值)和良好的产率(高达84%)得到。一个吸引人的实际考虑是,通过过滤未纯化的反应混合物可直接分离出纯产物。环己酮的进一步官能化在不干扰通过先前环化所构建的立体中心的情况下得以实现。