Triethylamine → 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-(3,4,5-trimethoxybenzoyl)piperazine

Beteiligte Stoffe

Reaktionsschritte

To a mixture of 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)piperazine (1.2 g), triethylamine (0.5 g) and methylene chloride (20 ml) is added dropwise, with stirring under ice-cooling, a solution of 3,4,5-trimethoxybenzoyl chloride (1.0 g) in methylene chloride (25 ml). The reaction mixture is stirred for one hour at room temperature. The reaction mixture is pourd into ice-water (100 ml), and extracted with methylene chloride. The organic layer is washed with water, dried and concentrated under reduced pressure. The concentrate is crystallized from ethyl acetatehexane to give 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-(3,4,5-trimethoxybenzoyl)piperazine (1.3 g), as obtained in Example 62, as colorless prisms, m.p. 164°-165° C.

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