Hydrochloric Acid → N-[(R)-1-[3-(4-piperidyl)-(E)-acryloyl]-3-piperidylcarbonyl]-3(S)-ethynyl-beta-alanine

Participants

Reaction Steps

To a solution of N-[(R)-1-[3-(1-tert-butoxycarbonyl-4-piperidyl)-(E)-acryloyl]-3-piperidylcarbonyl]-3(S)-ethynyl-β-alanine (1.23 g) in ethyl acetate (12 ml) was added 4N HCl in ethyl acetate (6.66 ml) at room temperature, and the reaction mixture was stirred for 2 hours. The precipitates were filtered, washed with diethyl ether and purified by preparative HPLC eluting with 0.1% trifluoroacetic acid-CH3CN (9:1), then the fractions containing the object compound were concentrated in vacuo. The residue was resolved in water, neutralized with 1N aq. NaOH, desalted by using the resin of HP-20 eluting with isopropanol-H2O (1:1), freeze-dried to give N-[(R)-1-[3-(4-piperidyl)-(E)-acryloyl]-3-piperidylcarbonyl]-3(S)-ethynyl-β-alanine as a white powder (0.7 g).

Provenance & Evidence