Reactions of furo[2,3-b]pyrroles with dimethyl butynedioate and ethyl propynoate were investigated. The reaction course is influenced by the substituents on the fused system. Products of [4+2]cycloaddition to the furan ring leading to indole derivatives have been observed. In the case of the reaction of methyl 6H-furo[2,3-b]pyrrole-5-carboxylate (1a) with dimethyl butynedioate, products of [4+2]cycloaddition to the furan ring as well as of Michael addition to the pyrrole ring leading to N-substituted indole derivative 3 have been observed.
研究了furo[2,3-b]pyrroles与二甲基丁炔二酸酯和丙炔酸乙酯的反应。反应过程受融合系统上取代基的影响。观察到对呋喃环的[4+2]环加成产生吲哚衍生物的产物。在甲基6H-furo[2,3-b]pyrrole-5-羧酸甲酯(1a)与二甲基丁炔二酸酯反应的情况下,观察到对呋喃环的[4+2]环加成产物以及对吡咯环的Michael加成产生N-取代吲哚衍生物3的产物。