Synthese von 1, 2-Dimethyl-phenanthro[1,2-b]furan und 1-Äthyl-2-methyl-phenanthro[1,2-b]furan. Furanabkömmlinge, 26. Mitteilung

We describe here the synthesis of 1,2-dimethyl-phenanthro 1,2-b] furan ( 11 ) and 1-ethyl-2-methyl-phenanthro 1,2-b] furan ( 13 ). The starting material was the known ethyl 2-methyl-phenanthro 1,2-b] furan-1-carboxylate ( 4 ). The two synthetized substances were characterized by their UV.-, IR.-, NMR.- and mass spectra, and identified with two products obtained by selenium dehydrogenation of anhydrohirundigenin.