Enolates of 1,3-diketones react with 4-chloroalkyl-1,4-dihydropyridines, giving 4-substituted-4,5-dihydroazepines, then, under more vigorous conditions, 2-azabicyclo[3.2.1]oct-3-enes, a cyclisation which may be an exception to Baldwin's 5-endo-trig rule.
B. Gregory, E. Bullock and T. Chen, J. Chem. Soc., Chem. Commun., 1979, 1070 DOI: 10.1039/C39790001070
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