[NH2:1][C:2]1[CH:12]=[C:11]([C:13]([CH3:16])([CH3:15])[CH3:14])[C:5]2[O:6][CH2:7][C:8]([CH3:10])([CH3:9])[C:4]=2[CH:3]=1.CN(C1C=CC=CN=1)C.[C:26](Cl)(=[O:28])[CH3:27].CCCCCC>C(Cl)Cl.CCOCC.CCOC(C)=O>[C:13]([C:11]1[C:5]2[O:6][CH2:7][C:8]([CH3:10])([CH3:9])[C:4]=2[CH:3]=[C:2]([NH:1][C:26](=[O:28])[CH3:27])[CH:12]=1)([CH3:16])([CH3:15])[CH3:14]To a solution of 5-amino-7-tert-butyl-3,3-dimethyl-2,3-dihydrobenzo[b]-furan (400 mg, 1.84 mmol) and dimethylaminopyridine (247 mg, 2.024 mmol) in CH2Cl2 (20 mL) is added at 24° C. acetyl chloride (130 μL, 1.84 mmol) in a single portion. The reaction is stirred for 1 h, and monitored by TLC (hexane:EtOAc, 9:1). The mixture is diluted with Et2O (5 mL), and a fine precipitate is filtered off. The filtrate is evaporated to an orange solid which is purified by preparative TLC (hexane:EtOAc, 9:1) to yield N-(7-tert-butyl-3,3-dimethyl-2,3-dihydrobenzo[b]furan-5-yl)acetamide as a white solid.
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