反应详情

4-(4-fluoro-2-methyl-phenyl)-piperazine-1,3-dicarboxylic acid 1-tert-butyl ester (CAS Reg. No.: [499780-10-8]) (100 mg) in DMF (2.5 mL) was treated with 1-(2,5-dimethylphenyl)piperazine (62 mg), 2-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyl-uronium hexafluoro phosphate (HBTU) (123 mg) and triethylamine (124 μL) at ambient temperature for 5 h. Water was added, the phases were separated and the inorganic phase was extracted with tert-butyl-methyl ether (TBME). The combined organic phases were washed with water and brine, dried (Na2SO4), filtered and evaporated. Purification by chromatography (SiO2, n-heptane/ethyl acetate 2:1) gave 3-[4-(2,5-dimethyl-phenyl)-piperazine-1-carbonyl]-4-(4-fluoro-2-methyl-phenyl)-piperazine-1-carboxylic acid tert-butyl ester as a white solid (143 mg), MS: 511.5 ([M+H]+).

1. customthe phases were separated
2. extractionthe inorganic phase was extracted with tert-butyl-methyl ether (TBME)
3. washThe combined organic phases were washed with water and brine
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. customevaporated
7. customPurification by chromatography (SiO2, n-heptane/ethyl acetate 2:1)