methyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-tert-butoxycarbonylpiperazine-2-carboxylate → methyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzo-cyclohepten-8-ylcarbonyl}piperazine-2-carboxylate hydrochloride

Participants

Reaction Steps

To a solution of 4.5N HCl-ethyl acetate solution (10 ml) is added methyl 1-(2,3-dimethoxy-6,7-dihydro- 5H-benzocyclohepten-8-ylcarbonyl)-4-tert-butoxycarbonylpiperazine-2-carboxylate (1.7 g). The reaction mixture is left standing at room temperature for 5 hours. Then the solvent is distilled off under reduced pressure. To the residue is added ethyl ether. Resulting precipitates are collected and dried to afford methyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzo-cyclohepten-8-ylcarbonyl}piperazine-2-carboxylate hydrochloride as colorless powder (1.2 g).

Provenance & Evidence