反应详情

Sodium borohydride (25 mg, 0.66 mmol) was added to a 0° C. slurry of the product of step A (124 mg, 0.659 mmol) in methanol (4.39 mL). After 30 min the reaction mixture was warmed to room temperature, and at 1.5 h the reaction was diluted with DCM and quenched with 0.1 N HCl. The aqueous was extracted with DCM (2×) and then washed with saturated aqueous NaCl (1×). The combined organic layer was dried over Na2SO4, filtered and evaporated in vacuo to yield the title compound. 1H NMR (500 MHz, CDCl3) δ 6.81 (d, J 7.5 Hz, 2H), 4.55 (s, 2H), 3.23 (s, 1H), 2.37 (s, 3H).

1. customquenched with 0.1 N HCl
2. extractionThe aqueous was extracted with DCM (2×)
3. washwashed with saturated aqueous NaCl (1×)
4. dry with materialThe combined organic layer was dried over Na2SO4
5. filtrationfiltered
6. customevaporated in vacuo