作者:Takafumi Saito、Kenshu Fujiwara、Yusuke Sano、Takuto Sato、Yoshihiko Kondo、Uichi Akiba、Yusuke Ishigaki、Ryo Katoono、Takanori Suzuki
DOI:10.1016/j.tetlet.2018.02.052
日期:2018.4
intermediate C42–C52 (L-ring) segment was problematic. Therefore, a new and improved procedure for the C42–C52 segment, having modified protecting groups, was developed. The new route includes a chirality transferring Ireland-Claisen rearrangement for the construction of the vicinal dimethyl branching at C47–48, a one-pot cyclization process for the establishment of the stereocenters at C45 and C46 as
在我们先前报道的构建雪茄毒素3C(CTX3C)IJKLM环的方法中,中间C42–C52(L环)链段的冗长合成过程存在问题。因此,针对C42–C52片段开发了一种经过改进的新方法,该方法具有修饰的保护基。新路线包括手性转移爱尔兰-克莱森重排,用于在C47-48处建立邻位二甲基支化;一锅环化过程,用于在C45和C46处建立立体中心,以及γ-羟基δ-内酯框架对应于L环,以及布朗的不对称巴豆基硼酸酯,用于在C43和C44处安装立体中心。新的C42–C52片段已与先前报道的C32–C41(I形环)片段成功配对,以生产IJKLM环。