Studies on the Total Synthesis of Formamicin: Synthesis of the C(1)−C(11) Fragment
作者:Noel A. Powell、William R. Roush
DOI:10.1021/ol0069610
日期:2001.2.1
[figure: see text] An efficient and highly concise synthesis of 6, corresponding to the C(1)-C(11) fragment of formamicin (1), has been accomplished by a route utilizing a diastereoselective lactate aldol reaction to set the C(6) tertiary ether and the TES-OTf mediated transketalization of the C(6) tertiary methoxymethyl ether and the C(25) PMB ether to set the seven-membered methylene acetal unit
[图:见正文]通过利用非对映选择性乳酸羟醛缩合反应设定C的途径,可以实现高效,高度简明的6合成,该合成相当于福米霉素(1)的C(1)-C(11)片段(6)叔醚和TES-OTf介导的C(6)叔甲氧基甲基醚和C(25)PMB醚的转缩酮化作用,以设置七元亚甲基缩醛单元(参见37-> 38)。