Convergent synthesis of (−)-mirabazole B using a chloroimidazolidium coupling reagent, CIP
作者:Naohiro Kuriyama、Kenichi Akaji、Yoshiaki Kiso
DOI:10.1016/s0040-4020(97)00523-1
日期:1997.6
(-)-Mirabazole B (1), an alkaloid consisting of four successive thiazoline/thiazole rings, has been synthesized in a convergent route. The key intermediate, a linear tripeptide amide 13 composing of three S-benzyl-2-methylcysteine residues, was prepared using 2-chloro-1,3-dimethyl-imidazolidium hexafluorophosphate (CIP) in the presence of 1-hydroxy-7-azabenzotriazole (HOAt) as a coupling agent. The successive thiazoline/thiazole rings were constructed by TiCl4-mediated cyclization followed by Hantzsch reaction without difficulty. (C) 1997 Elsevier Science Ltd.
(-)-Mirabazole B (1)是一种由四个连续的噻唑烷/噻唑环组成的生物碱,已通过一种收敛路线成功合成。其中的关键中间体是由三个S-苯甲基-2-甲基半胱氨酸残基组成的线性三肽酰胺13。该中间体利用2-氯-1,3-二甲基咪唑烷鎓六氟磷酸盐(CIP),在1-羟基-7-叠氮苯并三唑(HOAt)作为偶联剂的条件下制备而成。随后,通过TiCl4介导的环化反应和Hantzsch反应,成功构建了四个连续的噻唑烷/噻唑环。©1997 Elsevier Science Ltd.