Pyrrolidine → HCID 20550699, compound

Participants

Reaction Steps

The intermediate olefinic ketone is prepared by the procedure of H. M. E. Carwell [J. Chem. Soc., 1058 (1950)]. The ketone obtained from A., 22.8 g., in 25 ml. of ethanol was added to a solution of 25 g. of anhydrous oxalic acid in 75 ml. of ethanol. The mixture was cooled to 0° C., filtered to remove diethylamine hydrogen oxalate and the mother liquor evaporated to dryness under reduced pressure. The residue was dissolved in a little water, treated with potassium carbonate and extracted with ether. The ether was dried over anhydrous sodium sulphate and the residue obtained by solvent removal was distilled. After re-distillation the product was obtained as an oil, b.p. 82° C./18 mm. Similarly, the other 1,1-bis-(disubstituted aminomethyl)acetones obtained as in A. can be converted to the corresponding 3-disubstituted aminomethylbut-3-en-2-ones. The disubstituted amino term as previously indicated also comprises pyrrolidine and piperidine alicyclic ring analogs. For example, 3-(piperidinomethyl)but-3-en-2-one boils at 135°-139° C./15 mm. and is synthesized following the same procedure from 1,1-bis(-piperidinomethyl)acetone.

Provenance & Evidence