[CH3:1][N:2]([CH3:23])[C:3](=[CH:9][CH:10]=[C:11]([C:17]1C=CC=C[CH:18]=1)[C:12]([O:14][CH2:15][CH3:16])=[O:13])[C:4]([O:6][CH2:7][CH3:8])=[S:5].F[B-](F)(F)F.CN(C)C(C(OCC)=O)=CC=[N+](C)C.CC[O-].[Na+].C(SCC(OCC)=O)C>C(O)C>[CH3:23][N:2]([CH3:1])[C:3](=[CH:9][CH:10]=[C:11]([CH2:17][CH3:18])[C:12]([O:14][CH2:15][CH3:16])=[O:13])[C:4]([O:6][CH2:7][CH3:8])=[S:5]
The procedure is as in Example 2 for the preparation of diethyl 2-dimethylamino-5-phenylthio-2,4-hexadienedioate, starting with N-(3-dimethylamino-3-ethoxycarbonylpropenylidene)-N-methylmethanaminium tetrafluoroborate (10 g), a 2M ethanolic solution of sodium ethylate (21 cc) and ethyl (ethylthio)acetate (5.2 g) in ethanol (100 cc). Diethyl 2-dimethylamino-5-ethylthio-2,4-hexadienedioate (8.5 g) is thereby obtained in the form of a red oil, and is used in the crude state in the subsequent syntheses.
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