Synthetic studies on bafilomycin A1: stereoselective synthesis of the enantiopure C1–C11 fragment
作者:Emmanuelle Quéron、Robert Lett
DOI:10.1016/j.tetlet.2004.04.033
日期:2004.5
The synthesis of the enantiopure C1–C11 fragment of bafilomycin A1 has been achieved with a 4% overall yield over 18 steps from (R)-(+)-citronellol. Key steps involve Sharpless asymmetric epoxidation, Miyashita reaction of a γ,δ-epoxymethacrylate with trimethylaluminum in the presence of water, bis-OTMS selective Swern oxidations, Corey–Fuchs alkyne formation, Negishi's carbometalation, and stereoselective
从(R)-(+)-香茅醇的18个步骤中,合成了bafilomycin A 1的对映纯C 1 -C 11片段,总产率为4%。关键步骤包括Sharpless不对称环氧化,在水存在下γ,δ-环氧甲基丙烯酸酯与三甲基铝的Miyashita反应,bis-OTMS选择性Swern氧化,Corey-Fuchs炔烃形成,Negishi的碳金属化以及C 2 -C 3的立体选择性形成由α的维悌希型烯化三取代的共轭二烯的键,β不饱和C 3 -C 11醛与从容易获得的鏻盐[氯衍生的叶立德-,Ph 3 P + CH(OMe)COOMe]。