These HypPhos catalysts were assembled from trans-4-hydroxyproline, with the modular nature of the synthesis allowing variations of the exocyclic P and N substituents. Among them, exo-(p-anisyl)-HypPhos was most efficacious for [4 + 2] annulations between ethyl α-methylallenoate and imines. Through this method, (R)-aplexone was identified as being responsible for the decrease in the cellular levels
P-手性[2.2.1]双环膦(HypPhos催化剂)已应用于α-烷基联烯酸酯和
亚胺之间的反应,生产鳄梨毒肽衍
生物。这些 HypPhos 催化剂由
反式-4-羟基脯
氨酸组装而成,合成的模块化性质允许环外 P 和 N 取代基的变化。其中, exo -(对茴香基)-HypPhos 对于 α-甲基联烯酸
乙酯和
亚胺之间的 [4 + 2] 成环最有效。通过这种方法,( R )-aplexone 被确定为细胞
胆固醇水平降低的原因。