Tert-Butylamine → HCID 71293875, compound

Participants

Reaction Steps

Compound B4 (200 mg, 0.349 mmol) obtained in Step 1 of Example 42 was suspended in benzotrifluoride (10 mL). To the suspension were added tert-butylamine (0.19 mL, 1.7 mmol) and p-toluenesulfonic anhydride (228 mg, 0.698 mmol), and the mixture was stirred at room temperature for 18 hours. To the reaction mixture were added tert-butylamine (0.19 mL, 1.7 mmol) and p-toluenesulfonic anhydride (228 mg, 0.698 mmol) and the mixture was further stirred at room temperature for 18 hours. Further, to the reaction mixture were added tert-butylamine (0.19 mL, 1.7 mmol) and p-toluenesulfonic anhydride (228 mg, 0.698 mmol) and the mixture was further stirred at room temperature for 18 hours. A saturated aqueous sodium bicarbonate solution and water were added to the reaction mixture. Extraction with ethyl acetate and drying over anhydrous sodium sulfate were performed. After filtration, the solvent in the filtrate was evaporated under reduced pressure. The residue was dissolved in benzotrifluoride (2.0 mL) and trifluoroacetic acid (2.0 mL) and the solution was stirred at 70° C. for 18 hours. The solvent was evaporated under reduced pressure, and a saturated aqueous sodium bicarbonate solution and water were added to the residue. Extraction with ethyl acetate and drying over anhydrous sodium sulfate were performed. After filtration, the solvent in the filtrate was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform/methanol=1/10) to give Compound 45 (83.2 mg, 54% yield).

Provenance & Evidence