-unsaturated keto sulfones which have been conveniently utilized as precursors of both aromatic and non-aromatic 2,5-disubstituted five-mem- bered heterocyclic compounds. While 2,5-disubstituted pyrroles are efficiently formed by cyclodehydration of the starting materials, 2,5-disubstituted pyrrolidines and pyrrolenines could be obtained by prior reduction of the conjugated double bond followed by acid-
4-((4-甲基苯基)磺酰基)-1-(三苯基正膦亚基)丁-2-酮(1)与N-保护-
氨基醛的Wittig反应提供了N-保护-
氨基-,-不饱和酮砜用作芳香族和非芳香族 2,5-二取代五元
杂环化合物的前体。虽然 2,5-二取代
吡咯可通过起始材料的环化脱
水有效地形成,但 2,5-二取代
吡咯烷和
吡咯啉可通过预先还原共轭双键然后酸或碱介导的环化来获得。整个序列所需材料的现成可用性使该方法成为生成芳香族和饱和 2,5-二取代五元
杂环化合物的便捷方法。