Sodium ethoxide → Diethyl 2-dimethylamino-5-(2-naphthylthio)-2,4-hexadienedioate

Participants

Reaction Steps

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 (2-naphthylthio)acetate (12.9 g) in ethanol (100 cc). After purification by chromatography on a silica column with a mixture of cyclohexane and ethyl acetate (50:50 by volume) as eluent, diethyl 2-dimethylamino-5-(2-naphthylthio)-2,4-hexadienedioate (11.5 g) is obtained in the form of a yellow oil, and is used in the crude state in the subsequent syntheses.

Provenance & Evidence