反应详情

A solution of ethyl 6-benzyloxy-4-chloro-6-methyl-5,6,7,8-tetrahydroquinoline-3-carboxylate (5.0 g) and p-chlorophenylhydrazine (2.0 g) in 75 mL of n-butanol is stirred at room temperature for 4 hours, then refluxed overnight. The reaction mixture is evaporated and the residue is treated with Et2O and 2N NaOH. The alkaline layer is separated, the pH is adjusted at 8 with dilute HCl, and the resulting precipitate is collected. This material is washed with EtOH/Et2O and air-dried to obtain 8-benzyloxy-2-p-chlorophenyl-8-methyl-2,3,6,7,8,9-hexahydropyrazolo[4,3-c]quinolin-3(5H)-one.

1. temperaturerefluxed overnight
2. customThe reaction mixture is evaporated
3. additionthe residue is treated with Et2O and 2N NaOH
4. customThe alkaline layer is separated
5. customthe resulting precipitate is collected
6. washThis material is washed with EtOH/Et2O
7. customair-dried