Abstract
An efficient and a facile route to spiro- β-lactams is described. 3-allyl-3-methylthio- β-lactams, which are synthesized through a Lewis acid mediated C-3 alkylation of the trans-3-chloro-3-methylthio- β-lactams, undergo a facile intrasulfenyl cyclization reaction in the presence of halogens like bromine and iodine to give spiro β-lactams in good yield. These halospiro- β-lactams are then subjected to dehalogenation reaction using Raney-nickel. The resulting spiro- β-lactams are further transformed into their sulfinyl and sulfonyl derivatives by using m-chloroperbenzoic acid as an oxidant.
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Acknowledgement
We gratefully acknowledge the financial support for this work from Council of Scientific and Industrial Research (CSIR), New Delhi, India.
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All additional information pertaining to characterization of the representative compounds (4d, 5d, 8c, 9b, 10b, 11b) using 1H NMR and 13C NMR technique (Figures S1-S5) are given in the supporting information. Supplementary Information is available at www.ias.ac.in/chemsci.
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RESHMA, ARORA, R., HUNDAL, G. et al. An efficient synthesis of spiro- β-lactams having sulfenyl, sulfinyl and sulfonyl moiety. J Chem Sci 127, 1957–1966 (2015). https://doi.org/10.1007/s12039-015-0956-1
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DOI: https://doi.org/10.1007/s12039-015-0956-1