反应详情

4-Cyanothio-2-methoxycarbonyl-1-methylpyrrole (2.8 g, 14.3 mmol) is dissolved in 50 ml of methanol under nitrogen. Methyliodide (1.25 ml, 20 mmol) is added followed by 1.08 g (20 mmole) of sodium methoxide. After stirring for about 30 minutes at room temperature, the reaction mixture is concentrated to a paste and then diluted with 100 ml of ethylether. The resulting precipitate is filtered off and the filtrate concentrated to give an oil which is distilled at 100° to 104° at 0.25 mm-Hg to afford 2.2 g (86%) of 2-methoxycarbonyl-4-methylthio-1-methylpyrrole.

1. concentrationthe reaction mixture is concentrated to a paste
2. additiondiluted with 100 ml of ethylether
3. filtrationThe resulting precipitate is filtered off
4. concentrationthe filtrate concentrated
5. customto give an oil which
6. distillationis distilled at 100° to 104° at 0.25 mm-Hg