Dibutyl squarate → 1-Benzyloxycarbonyl-4-(4-butoxy-1,2-dioxo-3-cyclobuten-3-yl)-piperazine

Participants

Reaction Steps

A mixture comprising 1101 mg of N-benzyloxycarbonylpiperazine, 1131 mg of 3,4-dibutoxy-3-cyclobutene-1,2-dione and 5 ml of ethanol was stirred at room temperature for 25 hours. The reaction mixture was concentrated under reduced pressure, and the resulting residue was purified by silica gel column chromatography (solvent: chloroform-ethyl acetate (19:1)) to obtain 1570 mg of 1-benzyloxycarbonyl-4-(4-butoxy-1,2-dioxo-3-cyclobuten-3-yl)-piperazine.

Provenance & Evidence