[CH3:1]C([O-])(C)C.[K+].C1COCC1.[CH3:12][C:13]1[C:14]([NH:24][C:25](=[O:27])[CH3:26])=[CH:15][C:16]2[CH2:17][CH2:18][CH2:19][C:20](=O)[C:21]=2[CH:22]=1.O>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.CCOCC>[CH3:12][C:13]1[C:14]([NH:24][C:25](=[O:27])[CH3:26])=[CH:15][C:16]2[CH2:17][CH2:18][CH2:19][C:20](=[CH2:1])[C:21]=2[CH:22]=1
In a mechanically stirred 50 L vessel, Et2O (12.5 L) was added to methyltriphenylphosphonium bromide (1.81 kg, 5.06 mol). KOtBu (566 g, 5.06 mol) was added. The mixture was heated to reflux for about 1 h. THF (5 L) was added followed by addition of N-(3-methyl-5-oxo-5,6,7,8-tetrahydronaphthalen-2-yl)acetamide (75) (475 g, 2.19 mol). The mixture was warmed to reflux overnight. The reaction was diluted with Et2O (5 L). The resulting mixture was cooled to rt and then poured into water (30 L). After stirring for about 1 h at rt, the layers were left standing to separate. The aqueous layer was removed and the organic mixture was filtered rinsing with Et2O. The solids were dried in vacuo to afford N-(3-methyl-5-methylene-5,6,7,8-tetrahydronaphthalen-2-yl)acetamide (76) (284 g, 60% yield). 1H NMR (300 MHz, DMSO): δ 9.24 (s, 1H), 7.49 (s, 1H), 7.24 (s, 1H), 5.48 (m, 1H), 4.86 (m, 1H), 2.65 (m, 2H), 2.49 (m, 2H), 2.35 (s, 3H), 2.06 (s, 3H), 1.75 (m, 2H).
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