作者:Claire Gregg、Christian Gunawan、Audrey Wai Yi Ng、Samantha Wimala、Sonali Wickremasinghe、Mark A. Rizzacasa
DOI:10.1021/ol3033253
日期:2013.2.1
A formal total synthesis of the spiroketal containing cytotoxic myxobacteria metabolite spirangien A (1) is described. The approach utilizes a late introduction of the C20 alcohol that mirrors the biosynthesis of this compound. The key steps involved a high yielding cross metathesis reaction between enone 6 and alkene 7 to give E-enone 4 and a Mn-catalyzed conjugate reduction α-oxidation reaction to
描述了含有细胞毒性粘细菌代谢产物spirangien A(1)的spiroketal的正式全合成。该方法利用了C20醇的后期引入,这反映了该化合物的生物合成。关键步骤涉及烯酮6与烯烃7之间的高产率交叉复分解反应,得到E-烯酮4,以及Mn催化的共轭还原α-氧化反应,引入C20羟基。对α-羟基酮4进行酸处理后,将螺环酮19转化为已知的螺环素A(1)高级中间螺环酮3。