1-Phenylpiperazine → L-Isoleucine

Participants

Reaction Steps

A -5° C. solution of L-isoleucine, N-[1-(carboxymethyl)-L-prolyl] benzylamide (0.214 g, 0.58 mmol, 1.0 eq), and triethylamine (96 uL, 70 mg, 0.64 mol, 1.20 eq), in acetonitrile (6 mL) was treated with isobutyl chloroformate (83 uL, 86 mg, 0.63 mmol, 1.1 eq) followed by 4-phenylpiperazine (170 uL, 186 mg, 1.15 mmol, 2.0 eq). Workup as above provided 170 mg (57%) of L-isoleucine, N-[1-[2-(4-phenylpiperazine)-2-oxoethyl]-L-prolyl] benzylamide.

Provenance & Evidence