[CH3:1][O:2][C:3]1[CH:12]=[C:11]2[C:6]([CH2:7][CH2:8][C:9](=[O:15])[C:10]2([CH3:14])[CH3:13])=[CH:5][CH:4]=1.[Cl:16][S:17](O)(=[O:19])=[O:18].C(Cl)(=O)C(Cl)=O.CN(C)C=O>ClCCl>[CH3:1][O:2][C:3]1[C:4]([S:17]([Cl:16])(=[O:19])=[O:18])=[CH:5][C:6]2[CH2:7][CH2:8][C:9](=[O:15])[C:10]([CH3:13])([CH3:14])[C:11]=2[CH:12]=1To the dichloromethane (2 ml) solution of 7-methoxy-1,1-dimethyl-3,4-dihydro-1H-naphthalen-2-one (Compound A2, 200 mg, 0.980 mmol), chlorosulfonic acid (110 μl, 1.70 eq.) was added and the mixture was stirred at room temperature for 2 hr. To the reaction solution, oxalyl chloride (297 μl, 3.0 eq.) and N,N-dimethyl formamide (45 μl, 0.6 eq.) were added in three divided portions, and the mixture was stirred at room temperature for 30 min. The reaction solution was concentrated under reduced pressure to obtain the title compound (295 mg). Since the title compound is unstable, its structure was identified in the next step.
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