HCID 178458084, compound → HCID 178461774, compound

Participants

Reaction Steps

A solution of tert-butyl [(1S)-3-amino-1-(5-tert-butyl-1H-benzimidazol-2-yl)-2-methyl-3-oxopropyl]carbamate (Preparation 29, 3.07 g, 8.2 mmol) in DCM (50 mL) and TFA (10 mL) was stirred at room temperature for 3 hours before concentrating in vacuo. Saturated aqueous NaHCO3 solution (100 mL) was added and the product extracted with 2-MeTHF (4×100 mL). The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated in vacuo. The residue was purified using reverse phase column chromatography eluting with 0-40% acetonitrile in water. The resulting solid was dissolved in MeCN (40 mL) at 50° C. and methanol added before allowing the solution to cool. The resulting white precipitate was collected, dried, and further triturated with EtOAc (5 mL) twice to afford a white solid as the desired (2R,3S) diastereomer.

Provenance & Evidence