反应详情

2,4-Dimethyl-3,5-dicarbethoxy-pyrrole (2.4 g), acetic acid (35 ml), aq. hydriodic acid (35 ml) and paraformaldehyde (1.2 g) were heated at 100° C. for 4 hours under a stream of nitrogen. The crude product was obtained as in Example 5 then distilled (15 mm, 65° C.) to yield 0.44 g (36%), m.p. 107°-109°.