Addition reactions of Acetylenic Esters to 6,7-Dihydrobenzo[B]Furan-4(5H)-One, 6,7-Dihydroindol-4(5H)-One, 5,6-Dihydrobenzo[B]Furan-7(6H)-One and 5,6-Dihydroindol-7(6H)-One Ketoximes. Formation of Reduced Furo[G]- and Pyrrolo[G]-Indoles

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Abstract
Thermal rearrangement of 6,7-dihydrobenzo[b]furan-4(5H)-one and 4,5,6,7-tetrahydroindol-4-one 4(7)-O-(E)-(1,2-dimethoxycarbonylvinyl)ketoximes gave 4,5-dihydrofuro[2,3g]- and 4,5-dihydropyrrolo[2,3g]- and [3,2-g] indoles, three novel tricyclic systems