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note
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Oxazole 14 was prepared from i and acrylonitrile via ii and iii following methods described in ref 2 for the corresponding sequence from i and acetonitrile. (Formula Presented)
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(a) The role of the N-benzyl group in the selective N-alkylation has been probed using analogues of 20 where Bn is replaced by H and OBz by iodide (see ref 16b for methodology to access the deprotected aziridines). Treatment of the NH aziridine with MeOTf in the presence of 2,6-di-tert-butyl-4-methylpyridine in deuterated aceonitrile gave ca. 25% of the N-methylaziridine as well as recovered starting material and decomposition products. Characteristic NMR shifts for oxazolium protons were also observed, indicating that the rates of oxazole and aziridine alkylation are similar in the absence of the N-benzyl substituent.
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