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0 °C

Prepared using General Procedure 7: To a stirred solution of (S)-2-(((benzyloxy)carbonyl)amino)-3-(4-(5-bromopyrimidin-2-yl)phenyl)propanoic acid (962 mg, 2.11 mmol) and (R)-tert-butyl 2-aminopropanoate hydrochloride (383 mg, 2.11 mmol) in DMF (20 mL) was added DIEA (1.2 mL, 6.32 mmol). The mixture was cooled to 0° C. and HATU (802 mg, 2.11 mmol) was added portionwise. The cooling bath was removed and the mixture was allowed to warm to room temperature. After 1 h the mixture was poured onto citric acid (100 mL of a 0.1 M aqueous solution) and iso-hexanes (20 mL) and the resulting precipitate collected by filtration, washing successively with water (2×10 mL), ACN (3 mL) and iso-hexanes (2×5 mL) to afford 1.1 g (89%) of tert-butyl ((S)-2-(((benzyloxy)carbonyl)amino)-3-(4-(5-bromopyrimidin-2-yl)phenyl)propanoyl)-D-alaninate INT-42 as a white solid. LCMS-ESI (m/z) calculated for C28H31BrN4O5: 582.2. found 605.2 [M+Na]+, tR=7.94 min (Method 10).

1. customPrepared
2. customThe cooling bath was removed
3. temperatureto warm to room temperature
4. additionAfter 1 h the mixture was poured onto citric acid (100 mL of a 0.1 M aqueous solution) and iso-hexanes (20 mL)
5. filtrationthe resulting precipitate collected by filtration
6. washwashing successively with water (2×10 mL), ACN (3 mL) and iso-hexanes (2×5 mL)