反应详情

To a solution of (2S,5R)-tert-butyl 5-(N-(allyloxy)-2-nitrophenylsulfonamido)-4-(dimethylcarbamoyl)-2-(methoxymethyl)-5,6-dihydropyridine-1(2H)-carboxylate (Intermediate 140, 1.642 g, 2.96 mmol) in DCM (8 mL) was added trifluoroacetic acid (4.33 mL, 56.25 mmol) and stirred at rt for 30 minutes. Upon addition, the color of the solution immediately turned pink. Then the solvents were evaporated and the crude product redissolved in DCM and washed with 0.5N NaOH, brine, filtered and concentrated to obtain the desired product (1.346 g, 100%) as a beige foam.

1. additionUpon addition
2. customThen the solvents were evaporated
3. dissolutionthe crude product redissolved in DCM
4. washwashed with 0.5N NaOH, brine
5. filtrationfiltered
6. concentrationconcentrated