反应详情

To the solution of tert-butyl(6-chloro-4-iodopyridin-3-yl)carbamate (61 g, 0.172 mol) in 300 mL of anhydrous THF was added 60% NaH (7.6 g, 0.189 mol) at 0° C. under N2 atmosphere. After the addition was finished, the solution was stirred for 30 min, and then the solution of MeI (26.92 g, 0.189 mol) in 100 mL of dry THF was added. Then the solution was stirred at 0° C. for 3 hrs. TLC indicated the reaction was over. Water was added for quench, and EtOAc was added to extract twice. The combined organic phases were washed with brine, dried over Na2SO4, filtered and concentrated to afford 63 g of crude tert-butyl(6-chloro-4-iodopyridin-3-yl)(methyl)carbamate used into the following de-protection without the further purification.

1. additionAfter the addition
2. stirringThen the solution was stirred at 0° C. for 3 hrs
3. customfor quench
4. additionEtOAc was added
5. extractionto extract twice
6. washThe combined organic phases were washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated