Tetrahydrofuran → ethyl 5-methoxy-1-oxo-2,3-dihydro-1H-indene-2-carboxylate

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[C:23](#[N:24])[C:25](=[O:26])[O:27][CH2:28][CH3:29].[CH2:30]1[O:31][CH2:32][CH2:33][CH2:34]1.[CH3:13][Si:14]([N-:15][Si:16]([CH3:17])([CH3:18])[CH3:19])([CH3:20])[CH3:21].[CH3:1][O:2][c:3]1[cH:4][c:5]2[c:9]([cH:10][cH:11]1)[C:8](=[O:12])[CH2:7][CH2:6]2.[Li+:22]>>[CH3:1][O:2][c:3]1[cH:4][c:5]2[c:9]([cH:10][cH:11]1)[C:8](=[O:12])[CH:7]([C:25](=[O:26])[O:27][CH2:28][CH3:29])[CH2:6]2