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4. General procedure for preparation of aziridines 3: The appropriate heterocycle (1 mmol) was added to a rapidly stirred solution of the azirine 1 (1 mmol) in acetonitrile (10 mL) at room temperature containing a suspension of K2CO3 (6 mmol). The reaction mixture was monitored by TLC until no azirine 1 was detectable. The reaction mixture was then filtered and the filtrate was evaporated to dryness. The residue contained the aziridine 3 by NMR, in some cases together with traces of a diastereoisomer (Table 1). Analytical samples were obtained by crystallisation of the residues; all new compounds gave correct elemental analyses.
5. Barroso, M. T.; Kascheres, A. J. Org. Chem. 1999, 64, 49–53.