反应详情

To a 55/45 diastereoisomeric mixture of pentafluorophenyl (2S)-2-[(4S)-2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl]-4-methylpentanoate and pentafluorophenyl (2R)-2-[(4S)-2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl]-4-methylpentanoate (Intermediate 1, 484.8 mg; 1.22 mmol; 1.0 eq.) and triethylamine (339.13 μl; 2.45 mmol; 2.0 eq.) in DMF (10.0 mL) was added (3R)-3-methyl-1-[4-(trifluoromethyl)pyridin-2-yl]piperazine (Intermediate 9, 300 mg; 1.22 mmol; 1.0 eq.). After 14 h of reaction at RT, the solvent was evaporated and the residue dissolved in ether and extracted with water (3×). The combined organic layers were dried and evaporated to give an oil. This residue was purified by chromatography to give the title product (170 mg; 30.4% as a mixture of 2 diastereoisomers). M+(ESI): 458.4. HPLC (Condition A): Rt: 4.1 min (HPLC purity: 91.8%).

1. customAfter 14 h of reaction at RT
2. customthe solvent was evaporated
3. dissolutionthe residue dissolved in ether
4. extractionextracted with water (3×)
5. customThe combined organic layers were dried
6. customevaporated
7. customto give an oil
8. customThis residue was purified by chromatography