Abstract
An expeditious neat procedure was developed for the synthesis of a series of new methyl phenyl heterocyclic phosphinates (3a–l) through Michaelis–Arbuzov reaction by the reaction of various heterocyclic halides (Cl or Br) (1a–l) with dimethyl phenylphosphonite (2) under N2 atmosphere using a heterogeneous catalyst, LaCl3.7H2O. The advantages of the developed procedure are good yields (80–89%) of the products, less reaction time (2–3 h), avoiding toxic catalysts and harmful solvents and easy work-up procedure. Further, antimicrobial activity of the synthesized compounds was evaluated at different concentrations 50, 100 and 150 μg/mL. Biological data revealed that compounds 3i, 3j and 3h, 3j exhibited potential antibacterial and antifungal activities, respectively, while the rest of the compounds showed moderate antimicrobial activity.
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The author, GM thanks the University Grants Commission (UGC), New Delhi, for the award of UGC-Junior Research Fellowship (JRF). SR, and DSR are thankful to the UGC, New Delhi, for awarding Junior Research Fellowship (JRF) under the scheme of Basic Scientific Research Programme (BSR).
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The electronic supplementary information consists of antibacterial data (table S1, figures S1 and S2) and antifungal data (table S2 and figure S3) can be seen in www.ias.ac.in/chemsci.
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GOLLA, M., SYED, R., KATLA, V.R. et al. LaCl3.7H2O: An efficient catalyst for the synthesis of phosphinates (Michaelis–Arbuzov reaction) under neat conditions and their potential antimicrobial activity. J Chem Sci 126, 117–125 (2014). https://doi.org/10.1007/s12039-013-0550-3
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DOI: https://doi.org/10.1007/s12039-013-0550-3