Hydrochloric Acid → HCID 178422065, compound

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Reaction Steps

0.54 mL of BBr3 (1.43 g, 5.71 mmol) was added dropwise into a solution of compound 10 (260 mg, 0.48 mmol) in 10 mL of anhydrous CH2Cl2 at −78° C. Stirring was continued at −78° C. for 1 h, 0° C. for 1 h, and ambient temperature for 1 h. 50 grams of ice containing 5 mL of 6M HCl was added to the mixture and stirred for 1 h at room temperature. The aqueous layer was extracted with dichloromethane (3×50 mL). The combined organic layer was washed with water, brine and dried over MgSO4. The solvent was concentrated in vacuo and the residue was purified using C-18 column chromatography (H2O/Acetonitrile) followed by recrystallization from ethyl acetate/hexane to give 163 mg of compound 6a (70%) as brown-yellow solid. 1H NMR (600 MHz, CD3OD) δ 7.31 (s, 2H), 4.32 (m, 2H), 1.88 (s, 6H), 1.42 (s, 6H), 1.40 (s, 6H). 13C NMR (600 MHz, (CD3)2SO)) δ 187.10, 182.51, 150.92, 149.54, 147.60, 137.78, 137.10, 126.24, 125.00, 111.03, 27.07, 20.50, 20.35, 15.00. HPLC purity 99.5%, tR=11.60 min (Method A). HRMS calcd for C28H26O8 491.1700 (M+H). found 491.1696.

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