Synthèse d'analogues bihétérocycliques du phénanthrène: Les méthyl-1-[1]benzothinéo,benzoséléno[2,3-b ]pyrroles,et méthyl-1-[1]benzofuro,benzothiéno et benzoséléno[3,2-b ]pyrroles

The condensation of ethyl sarcosinate on 2- or 3-halogeno 3- or 2-formyl[1]benzofuran. benzothiophene or benzoselenophene, and on the related 2h-[1]-3-benzoheteroyclanones is described. In the last instances the resulting compounds were formylated in teh 2-position with subsequent. After hydrolysis and decarboxylation, the I1methy][1]benzothieno-, benzoseleno [2,3-b]pyrroles were were thus obtained.