The catalytic activity of a simple aminoalcohol that contains a bulky super silyl group [i.e., tris(trimethylsilyl)silyl (TTMSS)] bonded to the oxygen atom at the γ-position along with a primary amine moiety was examined in the enantioselective1,3-dipolarcycloaddition of nitrones to α,β-unsaturatedaldehydes. The organocatalyst successfully provided optically active isoxazolidines in good chemical
Synthesis and application of a recyclable ionic liquid-supported imidazolidinone catalyst in enantioselective 1,3-dipolar cycloaddition
作者:Zhi-Liang Shen、Kau Kiat Kelvin Goh、Colin Hong An Wong、Wan-Yi Loo、Yong-Sheng Yang、Jun Lu、Teck-Peng Loh
DOI:10.1039/c2cc31830j
日期:——
The synthesis of recyclable ionic liquid-supported imidazolidinone catalyst I and its application in 1,3-dipolar cycloaddition of nitrone with alpha,beta-unsaturated aldehyde with high performance were described. Most importantly, the catalyst I can be recovered and recycled for up to five runs without observing significant decrease in catalytic activity.
New Strategies for Organic Catalysis: The First Enantioselective Organocatalytic 1,3-Dipolar Cycloaddition
作者:Wendy S. Jen、John J. M. Wiener、David W. C. MacMillan
DOI:10.1021/ja005517p
日期:2000.10.1
catalytic strategy is also amenable to [3 + 2] cycloadditions between nitrones and α,β-unsaturatedaldehydes to provide isoxazolidines (eq 3), useful synthons for the construction of biologically important amino acids, β-lactams, amino carbohydrates, and alkaloids. To our knowledge, this is the first example of an organocatalytic 1,3-dipolarcycloaddition. Moreover, this study further documents that
Enantioselective 1,3-dipolar cycloadditions of nitrones with unsaturated aldehydes promoted by a recyclable tetraarylphosphonium supported imidazolidinone catalyst
作者:Xin Nie、Cuifen Lu、Zuxing Chen、Guichun Yang、Junqi Nie
DOI:10.1016/j.molcata.2014.06.015
日期:2014.11
The tetraarylphosphonium supported chiral imidazolidinone catalyzes the enantioselective1,3-dipolarcycloadditions of nitrones and α,β-unsaturatedaldehydes to provide isoxazolidine aldehydes in good yields with excellent diastereo- and enantioselectivities. Most importantly, the tetraarylphosphonium supported imidazolidinone catalyst can be readily recovered and recycled for further transformations