Imidazole → HCID 22865019, compound

Participants

Reaction Steps

To a solution of (2S,4R)-1-tert-butoxycarbonyl-4-tert-butyldimethylsiloxy-2-[(S)-1,3-dihydroxypropyl]pyrrolidine (16.95 g, 45.2 mmol) in methylene chloride (200 ml) were successively added tert-butylchlorodimethylsilane (6.81 g, 45.2 mmol), 4-N,N-dimethylaminopyridine (0.55 g, 4.5 mmol) and imidazole (3.08 g, 45.2 mmol) in a nitrogen atmosphere under cooling with ice under stirring. The mixture was stirred at room temperature for 1 h. Then, the reaction solution was poured into water (200 ml). The organic layer was washed with water, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue was subjected to silica gel column chromatography (Wakogel™ C-300, heptane-ethyl acetate=9:1→4:1) to give (2S,4R)-N-tert-butoxycarbonyl-4-tert-butyldimethylsiloxy-2-[(S)-3-tert-butyldimethylsiloxy-1-hydroxypropyl]pyrrolidine (20.36 g, yield: 92.0%).

Provenance & Evidence