Solid-phase Total Synthesis of (−)-Apratoxin A and Its Analogues and Their Biological Evaluation
作者:Takayuki Doi、Yoshitaka Numajiri、Takashi Takahashi、Motoki Takagi、Kazuo Shin-ya
DOI:10.1002/asia.201000549
日期:2011.1.3
Two approaches for the solid‐phase total synthesis of apratoxin A and its derivatives were accomplished. In synthetic route A, the peptide was prepared by the sequential coupling of the corresponding amino acids on trityl chloride SynPhase Lanterns. After cleavage from the polymer‐support, macrolactamization of 10, followed by thiazoline formation, provided apratoxin A. This approach, however, resulted
完成了两种方法进行固相全合成pratoxin A及其衍生物。在合成途径A中,通过在三苯甲基氯合成酶灯笼素上依次偶联相应的氨基酸来制备肽。从聚合物载体上裂解后,大环内酰胺化10,然后形成噻唑啉,提供了ApratoxinA。然而,这种方法导致收率低,因为尽管获得了类似物33,但化学选择性不足以形成噻唑啉环。但是,在合成路线B中,通过固相肽合成,使用氨基酸13 – 15和18制备了环化前体。最后的内酰胺化在溶液中进行以提供高总收率的人毒素A。然后,该方法成功地用于合成阿普毒素类似物。然后评估合成衍生物的细胞毒性活性。差向异构体34与Apratoxin A一样有效,O-甲基酪氨酸可以被7-叠氮基庚基酪氨酸替代而不会失去活性。在铜催化剂存在下,进行38与苯乙炔的1,3-偶极环加成反应,而不会影响噻唑啉环。