An efficient method for the synthesis of spiro and fused N-heterocyclic phosphor esters. Reactions of triketoindan-2-oxime with α-phosphonyl carbanions
摘要:
Treatment of triketoindan-2-oxime with alpha-phosphonyl carbanions in sodium ethanolate solution at reflux temperature led to a number of the corresponding substituted spiroisooxazole-, fused 1,3-oxazole, and 1,4-oxazine phosphor esters in moderate to high yields. Mechanisms for the formation of five- and six-membered rings are provided. A comparison of Wittig-Horner and Wittig reagent counterparts in reactions with the oxime is discussed. The various biological properties of selected examples of the synthesized products were studied.