反应详情

0.57 g of 1-[4-(1,4-dioxa-8-aza-spiro[4.5]dec-8-yl)-benzenesulfonyl]-pyrrolidine-2-carboxylic acid isopropyl ester ( ) was stirred in 20 mL methyl amine (40% wt in water) at 100° C. in a sealed tube for 5 days. The methyl amine was allowed to evaporate and the residual aqueous solution was left to stand overnight uncapped. The following morning, a white precipitate was present, which was collected by vacuum filtration. The precipitate was washed with water and hexanes. The original aqueous solution was then extracted twice with ethyl, acetate. The organic layer was then dried over sodium sulfate and concentrated in vacuo to afford more product. 0.31 g of the title compound was collected as a white solid; mp 137-139° C.; 1H NMR (CDCl3) δ 1.52-1.72 (m, 5H), 1.81 (t, J=5.82 Hz, 4H), 2.15-2.20 (m, 1H), 2.86 (d, J=4.95 Hz, 3H), 3.08-3.55 (m, 1H), 3.49-3.55 (m, 4H), 4.00 (s, 4H), 6.89-6.94 (m, 2H), 6.99-7.01 (m, 1H), 7.61-7.73 (m, 2H); MS (ES) m/z 410.0 (MH+); HRMS for C19H27N3O5S: 410.1740

1. customto evaporate
2. waitthe residual aqueous solution was left
3. filtrationwhich was collected by vacuum filtration
4. washThe precipitate was washed with water and hexanes
5. extractionThe original aqueous solution was then extracted twice with ethyl, acetate
6. dry with materialThe organic layer was then dried over sodium sulfate
7. concentrationconcentrated in vacuo
8. customto afford more product
9. custom0.31 g of the title compound was collected as a white solid