Catalytic Asymmetric [3+2] Cycloadditions of C-3 Unsubstituted 2-Indolylmethanols: Regio-, Diastereo- and Enantioselective Construction of the Cyclopenta[<i>b</i>]indole Framework
作者:Zi-Qi Zhu、Yang Shen、Xiao-Xue Sun、Ji-Yu Tao、Jin-Xi Liu、Feng Shi
DOI:10.1002/adsc.201600931
日期:2016.12.7
The first catalytic asymmetric [3+2] cycloaddition of 2‐indolylmethanols with 3‐vinylindoles has been established, which makes use of C‐3 unsubstituted 2‐indolylmethanol as a C3 building block in the presence of a chiral phosphoric acid. By using this strategy, biologically important cyclopenta[b]indole frameworks were efficiently constructed with regiospecificity in high yields (up to 99%), excellent
建立了第一个2-吲哚基甲醇与3-乙烯基吲哚的催化不对称[3 + 2]环加成反应,该方法在存在手性磷酸的情况下利用C-3未取代的2-吲哚基甲醇作为C 3结构单元。通过使用这种策略,可以高效地构建具有生物学特异性的重要环戊五烯[ b ]吲哚骨架,具有很高的区域选择性(高达99%),出色的非对映异构和对映选择性(高达> 95:5 dr,96:4 er)。该反应不仅代表了C-3未取代的2-吲哚基甲醇的第一个催化不对称[3 + 2]环加成反应,而且还面临2-吲哚基甲醇参与的对映选择性转化的巨大挑战。