Meerwein–Ponndorf–Verley alkynylation of aldehydes: Essential modification of aluminium alkoxides for rate acceleration and asymmetric synthesis
作者:Takashi Ooi、Tomoya Miura、Kohsuke Ohmatsu、Akira Saito、Keiji Maruoka
DOI:10.1039/b411090k
日期:——
A novel carbonyl alkynylation has been accomplished based on utilization of the Meerwein-Ponndorf-Verley (MPV) reaction system. The success of the MPV alkynylation crucially depends on the discovery of the remarkable ligand acceleration effect of 2,2'-biphenol. For example, the alkynylation of chloral (2c) with the aluminium alkoxide 6(R = Ph), prepared in situ from Me(3)Al, 2,2'-biphenol and 2-me
基于Meerwein-Ponndorf-Verley(MPV)反应系统的利用,已经完成了新型羰基炔化反应。MPV炔基化的成功关键取决于对2,2'-双酚的显着配体促进作用的发现。例如,由Me(3)Al,2,2'-联苯酚和2-甲基-4-苯基-3-丁炔-原位制备的铝醇盐6(R = Ph)将氯醛(2c)烷基化2-醇(1a)作为炔基来源,在室温下在CH(2)Cl(2)中平稳进行,得到所需的炔丙醇3ca,搅拌5 h后,收率几乎定量。通过不带任何金属炔烃的新转化的特征,可以通过以下事实可视化:带有酮羰基的炔基成功转移到醛羰基上,而酮羰基上没有任何副反应。