反应详情

温度

20 °C

To a mixture of tert-butyl 4-[(3-hydroxypropyl)amino]piperidine-1-carboxylate (Yokoyama et al., Bioorg. Med. Chem. 2008, 16, 7968) (710 mg, 2.75 mmol) and dry powdered K2CO3 (5.0 g, 36.0 mmol) in CH2Cl2 (20 mL) at 0° C. was added chloromethanesulfonyl chloride (1 mL, excess). The reaction mixture was stirred at 20° C. for 4 hrs, a solution of 40% aqueous dimethylamine (5 mL) was then added, and stirring was continued for a further 20 hrs. The organic layer was separated and the aqueous layer was further extracted with CH2Cl2 (2×20 mL). The combined organic fractions were washed with water (50 mL) and dried (Na2SO4). The solvent was removed to give an oily product. Chromatography on neutral alumina eluting with CH2Cl2/MeOH (98:2) gave tert-butyl 4-{[(chloromethyl)sulfonyl][3-(dimethylamino)propyl]amino}-1-piperidinecarboxylate, as an oil (946 mg, 87%): 1H NMR (CDCl3) δ 4.47 (s, 2H), 4.22 (br, 2H), 3.82-3.75 (m, 1H), 3.31-3.27 (m, 2H), 2.28-2.46 (m, 2H), 2.76-2.70 (m, 2H), 2.26 (t, J=6.9 Hz, 2H), 2.23 (s, 6H), 1.87-1.64 (m, 6H), 1.46 (s, 9H).

1. stirringstirring
2. waitwas continued for a further 20 hrs
3. customThe organic layer was separated
4. extractionthe aqueous layer was further extracted with CH2Cl2 (2×20 mL)
5. washThe combined organic fractions were washed with water (50 mL)
6. dry with materialdried (Na2SO4)
7. customThe solvent was removed
8. customto give an oily product