Sodium Carbonate → 4-Pyrrolidin-1-ylcarbonylmethyl-o-phenylenediamine

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Reaction Steps

A mixture of sodium dithionite (245 g) and sodium carbonate (196 g) in water (1129 ml) and methanol (1029 ml) was stirred and 2-nitro-4-pyrrolidin-1-ylcarbonylmethylaniline (30.5 g) was added over a period of five minutes. A further portion of water (1468 ml) was added and the solution was heated under reflux for 65 minutes. The volume was reduced in vacuo in several stages with any solid material removed by filtration between each stage. Any solid so removed was washed with methanol and the washings combined with the final filtrate. The resulting solution was evaporated to dryness and the residue dried by azeotropic distillation with toluene and then ethanol. The dried residue was extracted with boiling ethanol and the solution filtered to give a solution which yielded 4-pyrrolidin-1-ylcarbonylmethyl-o-phenylenediamine (m.p. 105°-108° C.) on evaporation.

Provenance & Evidence