反应详情

Trifluoroacetic acid (10 mL) was added to a solution of tert-butyl 4-(5-(methoxycarbonyl)thiophene-2-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate (example 30, step a) (0.45 g) in dichloromethane (40 mL) and the resultant mixture was allowed to stand at 20° C. for 1 hour. Toluene (50 mL) was added and the solvents removed under reduced pressure to afford the subtitled compound. Yield 0.46 g.

1. customthe solvents removed under reduced pressure