反应详情

To a solution of 2-(2,5-bis(2-(ethoxymethoxy)propan-2-yl)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (510 mg) in THF (15 mL) was added 6 N HCl (3.8 mL). The reaction mixture was stirred at rt for 5 h, and extracted with DCM (200 mL×2). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by Combiflash to give 6-(2-hydroxypropan-2-yl)-3,3-dimethylbenzo-[c][1,2]oxaborol-1(3H)-ol [112 mg, yield 45% (2 steps, step 5 and 6)] as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 8.93 (s, 1H), 7.77 (s, 1H), 7.57 (d, J=8.0 Hz, 1H), 7.32 (d, J=8.0 Hz, 1H), 4.98 (s, 1H), 1.43 (s, 12H) ppm; HPLC purity: 94.6% at 220 nm and 100% at 254 nm; MS: m/z=203.1 (M−17, ESI+).

1. extractionextracted with DCM (200 mL×2)
2. washThe combined organic layers were washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by Combiflash