反应详情

In dichloromethane (18 ml) is dissolved 2,3-dimethoxy-6,7-dihydro-5H-benzocycloheptene-8-carbonyl chloride (1.44 g). The solution is added dropwise taking 5 minutes, while stirring at 0° C., to a mixture of methyl 1-(3,4,5-trimethoxybenzyl)piperazine-2carboxylate dihydrochloride (2.16 g), triethylamine (2.5 g) and dichloromethane (25 ml). The reaction mixture is stirred for one hour at room temperature, and then poured into ice-water, followed by extraction with dichloromethane. The organic layer is washed with water and dried, then the solvent is distilled off under reduced pressure. The residue is purified by means of a silica gel column chromatography (hexane:ethyl acetate:acetone =3:3:1) to afford methyl 4-(2 3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl) -1-(3,4,5-trimethoxybenzyl)piperazine -2- carboxylate, which is identical with the product obtained in Working Example 25, as a colorless oily product (2.2 g).

1. additionThe solution is added dropwise
2. extractionfollowed by extraction with dichloromethane
3. washThe organic layer is washed with water
4. customdried
5. distillationthe solvent is distilled off under reduced pressure
6. customThe residue is purified by means of a silica gel column chromatography (hexane:ethyl acetate:acetone =3:3:1)