反应详情

To a solution of (2R,6R)-4-benzyl-2-methyl-6-(trifluoromethyl)morpholine (4-5, 4.1 g, 15.81 mmol) in MeOH (80 ml) was added concentrated HCl (6.6 ml, 79 mmol). This mixture was transferred to a Parr bottle containing 10% Pd/C (1.7 g, 1.597 mmol). The mixture was hydrogenated (45 psi) overnight. The mixture was filtered through a pad of Celite washing with MeOH then concentrated. The residue was taken up in MeOH and concentrated (3×) to afford (2R,6R)-2-methyl-6-(trifluoromethyl)morpholine hydrochloride (4-6, 3.34 g, 103%) as an off-white solid. 1H NMR (400 MHz, CDCl3): δ 4.59 (bs, 2H); 4.27 (bs, 2H); 3.01 (bs, 1H); 2.79 (bs, 1H); 1.33 (s, 3H).

1. custom(45 psi) overnight
2. filtrationThe mixture was filtered through a pad of Celite
3. washwashing with MeOH
4. concentrationthen concentrated
5. concentrationconcentrated (3×)