Ethanol → tert-butyl 6-(4-methylphenyl)-2H-1-benzopyran-3-carboxylate

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[B:19]([O-:20])([O-:28])[O:29][c:21]1[cH:22][cH:23][c:24]([CH3:27])[cH:25][cH:26]1.[Br:1][c:2]1[cH:3][cH:4][c:5]2[c:6]([cH:18]1)[CH:7]=[C:8]([C:11](=[O:12])[O:13][C:14]([CH3:15])([CH3:16])[CH3:17])[CH2:9][O:10]2.[C:30](=[O:31])([O-:32])[O-:33].[CH2:37]([OH:38])[CH3:39].[K+:34].[K+:35].[OH2:36].[c:40]1([CH3:41])[cH:42][cH:43][cH:44][cH:45][cH:46]1>>[c:2]1(-[c:21]2[cH:22][cH:23][c:24]([CH3:27])[cH:25][cH:26]2)[cH:3][cH:4][c:5]2[c:6]([cH:18]1)[CH:7]=[C:8]([C:11](=[O:12])[O:13][C:14]([CH3:15])([CH3:16])[CH3:17])[CH2:9][O:10]2