Reaction Steps
A solution of N-(((3R,4aR,12bS)-9-(4-fluorophenyl)-3-((triethylsilyl)oxy)-3-(trifluoromethyl)-1,2,3,4,4a,5,6,7,9,12b-decahydrobenzo[6,7]cyclohepta[1,2-f]indazol-12b-yl)methyl)acetamide compound with N-(43 S,4aS,12bR)-9-(4-fluorophenyl)-3-((triethylsilyl)oxy)-3-(trifluoromethyl)-1,2,3,4,4a,5,6,7,9,12b-decahydrobenzo[6,7]cyclohepta[1,2-f]indazol-12b-yl)methyl)acetamide (35, R1=4-Fluorophenyl, R3=Trifluoromethyl, Rg=TES) (195 mg, 0.32 mmol) in DCM (5 mL) was treated with TBAF (1M solution in THF, 0.32 mL, 0.32 mmol) at rt for about 30 min. The reaction was diluted with DCM (10 mL), washed with water (3×5 mL), dried over Na2SO4, filtered and concentrated to solids under reduced pressure. The residue was triturated in EtOAc (˜2 mL), filtered, rinsed with heptane and dried under vacuum to yield N-(((3R,4aR,12bS)-9-(4-fluorophenyl)-3-hydroxy-3-(trifluoromethyl)-1,2,3,4,4a,5,6,7,9,12b-decahydrobenzo[6,7]cyclohepta[1,2-f]indazol-12b-yl)methyl)acetamide; compound with N-(((3S,4aS,12bR)-9-(4-fluorophenyl)-3-hydroxy-3-(trifluoromethyl)-1,2,3,4,4a,5,6,7,9,12b-decahydrobenzo[6,7]cyclohepta[1,2-f]indazol-12b-yl)methyl)acetamide (36, R1=4-Fluorophenyl, R3=Trifluoromethyl, R4=Acetyl) as a white solid (125 mg, 72%); LC/MS, method 4, Rt=1.55 min, MS m/z 490 (M+H)+, 1H NMR (400 MHz, DMSO) δ 8.25 (d, J=0.7 Hz, 1H), 7.81-7.73 (m, 3H), 7.55 (s, 1H), 7.44-7.35 (m, 2H), 7.07 (t, J=5.9 Hz, 1H), 5.88 (s, 1H), 4.00-3.91 (m, 1H), 3.65-3.56 (m, 1H), 3.42-3.31 (m, 1H), 3.00-2.90 (m, 1H), 2.13-1.94 (m, 3H), 1.95-1.77 (m, 4H), 1.71-1.61 (m, 3H), 1.59 (s, 3H), 1.45-1.32 (m, 1H).
