Acetic Acid → 1,1,1-trifluoro-2-(4-((2S)-2-((3-oxetanylamino)methyl)-4-(2-thiophenylsulfonyl)-1-piperazinyl)phenyl)-2-propanol

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Reaction Steps

To a solution of 2-(4-((2S)-2-(aminomethyl)-4-(2-thiophenylsulfonyl)-1-piperazinyl)phenyl)-1,1,1-trifluoro-2-propanol (0.300 g, 0.667 mmol, Example 192, Step 1) in CH2Cl2 (5.0 mL) was added 3-oxetanone (0.050 mL, 0.67 mmol, Aldrich, St. Louis, Mo.), 4 molecular sieves (75 mg), and acetic acid (0.01 mL, 0.1 mmol). After stirred for 30 min, sodium triacetoxyborohydride (0.425 g, 2.01 mmol) was added and the reaction mixture was continued to stir at room temperature for 1 h. The reaction mixture was partitioned between saturated aqueous NaHCO3 (20 mL) and CH2Cl2 (40 mL). The aqueous layer was extracted with CH2Cl2 (2×15 mL) and the combined organic layers were dried over MgSO4 and concentrated. The crude product was purified by column chromatography (80 g of silica gel, 2 to 5% 2M NH3 in MeOH/CH2Cl2) to afford 1,1,1-trifluoro-2-(4-((2S)-2-((3-oxetanylamino)methyl)-4-(2-thiophenylsulfonyl)-1-piperazinyl)phenyl)-2-propanol (0.235 g) as a mixture of two isomers:

Provenance & Evidence