Concise Asymmetric Total Synthesis of Scyphostatin, a Potent Inhibitor of Neutral Sphingomyelinase
作者:Hiromichi Fujioka、Yoshinari Sawama、Naoyuki Kotoku、Takuya Ohnaka、Takashi Okitsu、Nobutaka Murata、Ozora Kubo、Ruichuan Li、Yasuyuki Kita
DOI:10.1002/chem.200700871
日期:2007.12.17
achieved in a late stage of the total synthesis, and deprotection of the primary alcohol was conducted in the final step. During the synthesis several key reactions were attained: 1) intramolecular bromoetherification of the cyclohexadiene acetal; 2) stereoselective introduction of the tertiary alcohol, 3) deprotection of the acetal function to the aldehyde by combination with silyl triflate/2,4,6-collidine
通过缩合旋光性环己烷单元(由我们自己的方法由市售1,4-环己二烯制备)和侧链(由Hoye和Tennakoon(TR Hoye,MA Tennakoon,Org.Lett.2000,2,1481-1483)。环氧环己烯酮单元的修饰是在总合成的后期完成的,伯醇的脱保护是在最后一步进行的。在合成过程中,获得了几个关键的反应:1)环己二烯缩醛的分子内溴醚化; 2)环己二烯缩醛的分子内溴醚化。2)立体选择性地引入叔醇,3)与三氟甲磺酸硅酯/ 2,4结合使乙缩醛官能团与醛脱保护,从二羟基乙缩醛化合物中6-可力丁和一锅合成具有不同甲硅烷基基团的二甲硅烷基醛化合物;4)伯醇的2,4-二甲氧基苯基甲基((2,4)DMPM)保护基的容易的脱保护。