Metal-mediated alkynediol cycloisomerization: first and second generation formal total syntheses of didemniserinolipid B
作者:Shyamsundar Das、Boddeti Induvadana、C.V. Ramana
DOI:10.1016/j.tet.2012.12.045
日期:2013.2
A formal total synthesis of didemniserinolipid B was developed by employing a regioselective metal-mediated 6-endo-dig alkynol-cycloisomerization reaction. Two routes for the synthesis of key Burke's intermediate have been developed. Our initial approach involved the introduction of a C17-alkynol followed by Pd-mediated cycloisomerization and then coupling with the serinol unit prior to the introduction
通过使用区域选择性金属介导的6-内切-乙炔基-环异构化反应,开发了双美金刚烷脂B的正式全合成。已经开发了两种合成关键伯克中间体的途径。我们最初的方法涉及先引入C 17-炔醇,然后进行Pd介导的环异构化,然后再与丝氨醇单元偶联,然后通过选择性氧化1°-OH引入α,β-不饱和酯单元,然后引入两个-碳维蒂希(Wittig)认证。另外,第二代策略的特征是将丝氨醇与C 17偶联-炔醇,然后将炔烃加到环氧化物中,然后进行乙交酯保护的炔二醇单元的Au介导的环异构化。这种方法避免了数个后期保护-解除保护事件。