Reactions of cyclic 1,3-dicarbonyl compounds with 1,2(1,4)-dihydro-1-methyl-2(4)-methylene-N-heterocycles. A new access to 6,12-methano-dibenz[d,g]-[1,3]oxazocinones
作者:Hans-Georg Henning、Le Hoang Thanh、Jörg Laue、Barbara Urban、Günter Reck
DOI:10.1007/bf00811679
日期:1994.1
The enamine-type methylene-N-heterocycles 1-5 react with cyclic 2-ethoxymethylene-1,3-dicarbonyl compounds 6 to give 2-[2-(hetarylidene)ethylidene]-1,3-dicarbonyl compounds 7-14. The result of the reactions between 1,2-dihydro-1-methyl-2-methylene-quinoline (Ia) and cyclic 1,3-dicarbonyl compounds depends on the nature of the dihydro intermediates A/B. Dehydrogenation of keton intermediates A results in 2-(1,2-dimethyl-4(1H)-quinolylidene)-1,3-dicarbonyl compounds 17-21. Enol intermediates B with 6-membered dicarbonyl ring form 6,12-methano-dibenz[d,g][1,3]oxazocinones 22-25. H-1 NM R spectra and X-ray structure analysis prove the structure of 23.