Indium-assisted aluminium-based stereoselective allylation of prostereogenic α,α-disubstituted cycloalkanones and imines
作者:Chennakesava Reddy、Srinivasarao Arulananda Babu、Nayyar Ahmad Aslam
DOI:10.1039/c4ra04293j
日期:——
Al0 for the allylation of a variety of prostereogenic α,α-disubstituted (hindered) cycloalkanones, 1,2-dione-based systems and various imino systems (CN functional groups) is reported. The stereoselective InCl3-catalyzed Al-based allylation of various 2-substituted-2-carbethoxycycloalkanones gave the corresponding products with moderate to excellent diastereoselectivity. The allylation and propargylation
催化量的InCl 3和Al 0的组合用于烯丙基化各种促成α,α-二取代(受阻)的环烷酮,1,2-二酮基体系和各种亚氨基体系(C N官能团)的烯丙基化被报道。各种2-取代的-2-碳乙氧基环烷酮的立体选择性InCl 3催化的基于Al的烯丙基化,给出了具有中等至优异的非对映选择性的相应产物。使用催化量的InCl 3与Al 0结合使用,使包括α-亚氨基酯在内的亚胺的烯丙基化和炔丙基化得到中等至良好收率的相应的烯丙基化和炔丙基化化合物。如果将γ-取代的烯丙基卤化物添加到亚氨基化合物中,则获得低至非常好的非对映选择性。手性N-叔丁基亚磺酰基亚胺系统的烯丙基化以中等收率提供了相应的产物,具有良好或优异的非对映选择性。