C(O)(=O)C.[C:5]1([CH3:19])[CH:10]=[CH:9][C:8]([O:11][C:12]2[S:16][C:15]([CH:17]=O)=[CH:14][CH:13]=2)=[CH:7][CH:6]=1.[N+:20]([CH3:23])([O-:22])=[O:21].C([O-])(=O)C.[NH4+]>C(OCC)(=O)C.O>[N+:20](/[CH:23]=[CH:17]/[C:15]1[S:16][C:12]([O:11][C:8]2[CH:9]=[CH:10][C:5]([CH3:19])=[CH:6][CH:7]=2)=[CH:13][CH:14]=1)([O-:22])=[O:21]
To an acetic acid (20.0 mL) solution of 5-p-tolyloxy-thiophene-2-carbaldehyde (2.30 g, 10.5 mmol) described in Manufacturing Example 48-1-2 were added nitromethane (3.20 g, 52.5 mmol) and ammonium acetate (1.62 g, 21.0 mmol) under nitrogen atmosphere at room temperature, which was stirred for 2.5 hours at 100° C. Water and ethyl acetate were added to the reaction mixture, and the organic layer was extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The solvent was evaporated from the filtrate under a reduced pressure to obtain the title compound (2.50 g) as a crude product.
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