A robust method toward the synthesis of diastereomerically pure methyl (2S)-2-(1-benzyl-3-oxo-1,3-dihydro-2H-isoindol-2-yl)-3-methylbutanoate has been described. The key reactions in the synthesis are: HATU-mediated coupling, Pd-catalyzed Sonogashira coupling, base-mediated 5-exo-dig cyclization, and catalytic hydrogenation. The diastereomeric mixture is subjected to trituration with heptane to furnish both diastereomers in moderate yields. The relative stereochemistry was confirmed by the single crystal X-ray diffractometry. The key feature of the method is the simplicity of the diastereomeric separation.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2020, 56(10), 1370–1374
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Nighot, D., Jain, A.K., Singh, M. et al. A Convenient 5-exo-dig Cyclization Route to Diastereomerically Pure Methyl (2S)-2-(1-benzyl-3-oxo-1,3-dihydro-2H-isoindol-2-yl)-3-methylbutanoate. Chem Heterocycl Comp 56, 1370–1374 (2020). https://doi.org/10.1007/s10593-020-02825-y
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DOI: https://doi.org/10.1007/s10593-020-02825-y