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    A library of star-shaped 2H-imidazolines has been synthesized via Debus-Radziszewski condensation from 1,2-diketones and ketone starting materials. Selective reduction of one imine group of the 2H-imidazole intermediate with LiAlH4 or catalytic flow hydrogenation furnished 2H-imidazolines, which could be conveniently diversified by reacting the amine N with electrophiles, resulting in a set of 21 amide-, carbamate-, urea-, and allylamine-containing products. In total, five points of diversification could be used, which allow the production of a set of functionally diverse compounds. The synthesis of acylated 2H-imidazolidines resulted in intrinsically labile compounds, which spontaneously degraded to acyclic derivatives, as shown for the reaction of 2H-imidazolidine with hexylisocyanate.


    Xuepu Yu, Nikolaus Guttenberger, Elisabeth Fuchs, Martin Peters, Hansjörg Weber, Rolf Breinbauer. Diversity-Oriented Synthesis of a Library of Star-Shaped 2H-Imidazolines. ACS combinatorial science. 2015 Nov 9;17(11):682-90

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    PMID: 26402035

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