反应详情

N-(2-Bromo-5-chloro-pyridin-3-yl)-4-tert-butyl-N-methoxymethyl-benzenesulfonamide (140 mg, 300 mmol) was placed in a dry 2-neck 10 mL round-bottom flask. The flask was evacuated and purged with nitrogen, followed by the addition of THF (1 mL). The homogeneous mixture was lowered to −5° C. and iPrMgCl (0.33 mL, 2.0 M) was added dropwise. Upon completion of the addition, the reaction was stirred 90 minutes, followed by the slow addition of 3,N-dimethoxy-N-methyl-benzamide (146 mg, 750 mmol). The reaction was stirred overnight, during which the ice-bath warmed to room temperature. The following day, the reaction was quenched with a small quantity of MeOH and the solvents evaporated in vacuo. The residue was subsequently treated with 4.0 M HCl in dioxane (1 mL, 4.0 mmol) and H2O (0.33 mL), and then stirred at 80° C. for two hours. The resultant solution was diluted with EtOAc, washed with water, saturated sodium bicarbonate, and brine; dried with MgSO4, and evaporated employing reduced pressure. The crude residue was subsequently purified via reverse phase HPLC (Column: Varian Dynamax 250×21.4 mm Microsorb100-8 C18, 0.1% TFA/H2O (Eluent A): 0.1% TFA/MeCN (Eluent B)): 1H NMR (400 MHz, CDCl3) δ 10.61 (s, 1H), 8.29 (d, 1H), 8.20 (d, 1H), 7.74 (d, 2H), 7.58 (s, 1H), 7.50 (d, 1H), 7.42 (d, 2H), 7.37 (d, 1H), 7.29 (t, 1H), 2.40 (s, 3H), 1.25 (s, 9H); MS (ES) M+H expect 459.1, found 459.5.

1. customThe flask was evacuated
2. custompurged with nitrogen
3. additionfollowed by the addition of THF (1 mL)
4. customwas lowered to −5° C.
5. additioniPrMgCl (0.33 mL, 2.0 M) was added dropwise
6. additionUpon completion of the addition
7. customThe following day, the reaction was quenched with a small quantity of MeOH
8. customthe solvents evaporated in vacuo
9. stirringstirred at 80° C. for two hours
10. washwashed with water, saturated sodium bicarbonate, and brine
11. dry with materialdried with MgSO4
12. customevaporated
13. customThe crude residue was subsequently purified via reverse phase HPLC (Column: Varian Dynamax 250×21.4 mm Microsorb100-8 C18, 0.1% TFA/H2O (Eluent A): 0.1% TFA/MeCN (Eluent B))