Hydrazine hydrate (1:1) → 3-[3-(1,3-Dioxolan-2-yl)phenoxy]propanamine

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Reaction Steps

A solution of N-{3-[3-(1,3-dioxolan-2-yl)phenoxy]propyl}phthalimide (119.4 g, 0.3 mole) and hydrazine hydrate (78.6 mL, 1.62 mole) in 95% ethyl alcohol (1.5 L) was heated at reflux temperature for 17.5 hours. The thick white mixture was cooled in an ice-water bath, filtered and the solid washed with ice cold 95% ethyl alcohol. The combined filtrate and washings were evaporated under reduced pressure and the residue was partitioned between 940 mL of 5% aqueous sodium hydroxide and 500 mL of dichloromethane. The aqueous phase was extracted with 500 mL of dichloromethane and the combined organic phase was extracted with 300 mL of saturated aqueous sodium chloride. The organic phase was dried, evaporated under reduced pressure and the residue was distilled under high vacuum to give 49.9 g of the title compound; bp=143°-147° C. at 0.25 mmHg.

Provenance & Evidence