Diisopropylethylamine → Rac-4-(2-iodo-5-methanesulfonyl-benzoyl)-3-methyl-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a solution of rac-3-Methyl-piperazine-1-carboxylic acid tert-butyl ester (350 mg, 1.75 mmol) in dimethylformamide (3 ml) were added 2-Iodo-5-methanesulfonyl-benzoic acid (540 mg, 1.67 mmol), N-ethyldiisopropylamine (1.8 ml, 10.5 mmol), and TBTU (630 mg, 1.92 mmol). The reaction mixture was then allowed to stir at room temperature for 16 hours. The reaction mixture was then concentrated in vacuo and the residue was purified by column chromatography (SiO2, 20 g, Heptane/EtOAc 0-100%) to give the title compound (400 mg, 45%). MS (m/e): 526.2 (M+NH4+).

Provenance & Evidence