[CH2:1]([O:4][C@H:5]1[C:13]2[C:8](=[CH:9][C:10]([O:14][CH3:15])=[CH:11][CH:12]=2)[C@@H:7]([NH:16]C(=O)C(F)(F)F)[CH2:6]1)[CH:2]=[CH2:3].C(=O)([O-])[O-].[K+].[K+].CO>O>[CH2:1]([O:4][C@H:5]1[C:13]2[C:8](=[CH:9][C:10]([O:14][CH3:15])=[CH:11][CH:12]=2)[C@@H:7]([NH2:16])[CH2:6]1)[CH:2]=[CH2:3]Step U (2): N-((1S,3R)-3-(allyloxy)-6-methoxy-2,3-dihydro-1H-inden-1-yl)-2,2,2-trifluoroacetamide (1.28 g, 4.06 mmol) from Step U (1), potassium carbonate (2.85 g, 20.8 mmol) and MeOH (92 mL)/H2O (6 mL) were heated at reflux for 16 h. The reaction mixture was concentrated in vacuo. Added water to the residue, extracted with EtOAc, washed the organic layers with brine, dried over Na2SO4, filtered and concentrated to afford 780 mg (quantitative yield) of the title compound as light brown oil. HRMS (M+H)+=220.1336; [α]D +18.72 (c=8.86 mg/mL, ethanol) 1H NMR (500 MHz, CDCl3) δ ppm 1.66 (s, 1H) 1.76 (d, J=12.82 Hz, 1H) 2.74-2.83 (m, 1H) 3.81 (s, 3H) 4.04-4.18 (m, 3H) 4.77 (t, J=5.80 Hz, 1H) 5.18 (dd, J=10.38, 1.53 Hz, 1H) 5.32 (dd, J=17.24, 1.68 Hz, 1H) 5.97 (dd, 1H) 6.90 (d, J=2.44 Hz, 1H) 7.30 (d, J=8.24 Hz, 1H).
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