(R)-2-(5-methylisoxazol-3-yl)but-3-yn-2-ol → HCID 89754455, compound

Participants

Reaction Steps

Similar to as described in General Procedure G, racemic methyl 10-bromo-6-(morpholinomethyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-2-carboxylate was reacted with (2R)-2-(5-methyl-1,2-oxazol-3-yl)but-3-yn-2-ol to produce methyl 10-((R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-yn-1-yl)-6-(morpholinomethyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-2-carboxylate as a diasteromeric mixture. A suspension of methyl 10-((R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-yn-1-yl)-6-(morpholinomethyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-2-carboxylate (220 mg, 0.45 mmol, 1.00 equiv) in aqueous ammonia (40 mL) was stirred overnight at 60° C. The resulting mixture was concentrated under vacuum and the residue was purified on a silica gel column with dichloromethane/methanol (20:1). This resulted in 43 mg (20%) of 10-((R)-3-hydroxy-3-(5-methylisoxazol-3-yl)but-1-yn-1-yl)-6-(morpholinomethyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-2-carboxamide as a colorless solid. The two diasteromers were separated by Chiral-Prep-HPLC with the following conditions: Column, CHIRALPAK IC-3; mobile phase, Hex (0.1% TEA):EtOH=50/50; Detector, 254 nm. This resulted in 12.2 mg (30%) of Compound 1 and 15.3 mg (38%) Compound 2.

Provenance & Evidence