Pyridinio??isoalloxazinophanes as Model Systems for Active??Site Complexes in Flavoenzymes: Syntheses, X??Ray Structure Analyses and Spectroscopic Properties
Abstract As model systems for active site complexes in flavoenzymes, flavin and nicotinamide analogues were linked together in cyclophane skeletons of specific sterical structures. Elaborating this concept, we prepared [4] metacyclo [3](10, 6) isoalloxazinophane (3),[4](3, 1) pyridino [3](10, 6) isoalloxazinophane (4), as well as the 16-methoxycarbonyl and the 16-carboxylato derivatives (2 and 34, resp.), of 4 by multistep syntheses. For the ...