The reaction of cyanophosphates, which are readily derived from γ-ketoaldehyde acetals, with TMSN3 (3 eq)/Bu2SnO (0.3 eq) in refluxing toluene directly furnished 3-substituted-2-cyclopentenones in modest to good yield under mild conditions. The present method was further applied toward the synthesis of dechlorotrichodenone C isolated from Trichoderma asperellum.
氰基磷酸酯很容易衍生自γ-酮醛缩醛,它与TMSN 3(3 eq)/ Bu 2 SnO(0.3 eq)在回流的甲苯中反应,在温和的条件下以适度到良好的收率直接提供了3-取代的2-环戊烯酮。本发明的方法进一步应用于从曲霉木霉分离的脱氯麦草酮C的合成。
First total syntheses and configurational assignments of cytotoxic trichodenones A–C
Total syntheses of cytotoxic trichodenones A-C, produced by a strain of Trichoderma harzianum from the sponge Halichondria okadai, have been achieved, and the natural trichodenones B and C have been established to have (4R,1'R)- and(1'R)-configurations, respectively. From this synthesis and chiral HPLC analysis, it was deduced that the major molecule with R-configuration coexists with its enantiomer in natural trichodenone A. (C) 2000 Elsevier Science Ltd. All rights reserved.