反应详情

To a cold solution of (R)-2-(tert-butoxycarbonylamino)-3,3-dimethylbutanoic acid (0.50 g, 2.16 mmol) in acetonitrile (8 mL) was added methylamine hydrochloride (0.48 g, 7.13 mmol), followed by DIEA (1.67 g, 12.9 mmol). The resulting mixture was stirred for 20 min and TBTU (0.76 g, 2.37 mmol) was added and the stirring continued overnight. The mixture was concentrated, diluted with EtOAc (30 mL) and washed successively with aqueous 5% KHSO4, saturated NaHCO3 solution and brine, dried over anhydrous Na2SO4, filtered and concentrated to provide Intermediate 30A (0.41 g, 77%).

1. customthe stirring continued overnight
2. concentrationThe mixture was concentrated
3. additiondiluted with EtOAc (30 mL)
4. washwashed successively with aqueous 5% KHSO4, saturated NaHCO3 solution and brine
5. dry with materialdried over anhydrous Na2SO4
6. filtrationfiltered
7. concentrationconcentrated