反应详情

To the solution of 42b (1.0 eq.) cooled on ice bath was added NaH (4.0 or 1.5 eq.). The resulting mixture was stirred for an hour and was then added 2-bromo-N,N-dimethylacetamide (1.0 eq.), the reaction mixture was stirred at room temperature for several hours. LC/MS detection was applied to determine completion of the reaction. DMF was evaporated under reduced pressure and the residue was precipitated with 5% diethylamine/methanol under sonication. The solid was collected by filtration, washed with methanol twice, and further purified by column chromatography to obtain title compound (30 mg, 13.6% yield) as orange solids: 1H NMR (300 MHz, DMSO-d6): δ=13.73 (s, 1H), 10.93 (s, 1H), 8.05-8.08 (d, 1H), 7.74-7.80 (m, 2H), 6.82-6.97 (m, 2H), 5.06-5.15 (q, 1H), 4.39-4.58 (m, 3H), 4.05-4.11 (q, 1H), 2.97 (s, 3H), 2.84 (s, 3H), 2.44-2.47 (ds, 6H). LC/MS: 468.2 [M−H]+.

1. customcompletion of the reaction
2. customDMF was evaporated under reduced pressure
3. customthe residue was precipitated with 5% diethylamine/methanol under sonication
4. filtrationThe solid was collected by filtration
5. washwashed with methanol twice
6. customfurther purified by column chromatography