Hydrochloric Acid → Methyl 4-(3-methyl-1-oxobutyl)-1-(1-naphthalenylmethyl)-1H-pyrrole-3-carboxylate

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Reaction Steps

To sodium hydride (0.42 g of a 60% oil dispersion, 0.0105 mol), freed from oil, stirred in dry dimethyl formamide (15 ml) under nitrogen was added methyl 4-(3-methyl-1-oxobutyl)-1H-pyrrole-3-carboxylate (2.2 g) prepared as described in b) above in portions over 20 minutes. After 10 minutes, potassium iodide (0.01 g) and (1-naphthalenyl)methyl chloride (1.85 g) in dimethyl formamide (20 ml) were added. The mixture was stirred for 4 hours and then poured into 0.5M hydrochloric acid and extracted with ethyl acetate. The organic layer was washed well with water and then brine, dried and evaporated to a gum, which was chromatographed with ethyl acetate-isohexane (1:3) to give an oil. The oil was crystallised from cyclohexane to yield the subtitle pyrrole (2.6 g).

Provenance & Evidence