Aldolase-Catalyzed Asymmetric Synthesis of N-Heterocycles by Addition of Simple Aliphatic Nucleophiles to Aminoaldehydes

Raquel Roldán, Karel Hernández, Jesús Joglar, Jordi Bujons, Teodor Parella, Wolf Dieter Fessner, Pere Clapés

    Research output: Contribution to journalArticleResearch

    5 Citations (Scopus)

    Abstract

    © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. Nitrogen heterocycles are structural motifs found in many bioactive natural products and of utmost importance in pharmaceutical drug development. In this work, a stereoselective synthesis of functionalized N-heterocycles was accomplished in two steps, comprising the biocatalytic aldol addition of ethanal and simple aliphatic ketones such as propanone, butanone, 3-pentanone, cyclobutanone, and cyclopentanone to N-Cbz-protected aminoaldehydes using engineered variants of d-fructose-6-phosphate aldolase from Escherichia coli (FSA) or 2-deoxy-d-ribose-5-phosphate aldolase from Thermotoga maritima (DERATma) as catalysts. FSA catalyzed most of the additions of ketones while DERATma was restricted to ethanal and propanone. Subsequent treatment with hydrogen in the presence of palladium over charcoal, yielded low-level oxygenated N-heterocyclic derivatives of piperidine, pyrrolidine and N-bicyclic structures bearing fused cyclobutane and cyclopentane rings, with stereoselectivities of 96–98 ee and 97:3 dr in isolated yields ranging from 35 to 79%. (Figure presented.).
    Original languageEnglish
    Pages (from-to)2673-2687
    JournalAdvanced Synthesis and Catalysis
    Volume361
    DOIs
    Publication statusPublished - 6 Jun 2019

    Keywords

    • Aldol reaction
    • Aldolases
    • Biocatalysis
    • Nitrogen heterocycles
    • Reductive amination

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