Reactions of Nitroalkenes with Nitroalkanes or Sulfur Ylides Catalyzed by Amine-Thiourea Bifunctional Polymeric Organocatalysts
作者:Patrick Toy、Jinni Lu
DOI:10.1055/s-0031-1289900
日期:2011.12
Non-cross-linked and cross-linked bifunctional polystyrenes bearing both amine and thiourea groups have been synthesized and used as organocatalysts in reactions between nitroalkenes and nitroalkanes or sulfur ylides. Control experiments using monofunctional polymers with only either amine or thiourea groups attached indicated that both functional groups were essential for efficient catalysis of the reactions studied. The non-cross-linked polystyrene was soluble in typical organic solvents and was used as a homogeneous catalyst, while the cross-linked polystyrene was used as a heterogeneous catalyst.
Diastereoselective Synthesis
of <i>syn</i>-1,3-Dinitro Compounds by Michael Addition
of Nitroalkanes to Nitroalkenes with a Thiourea Catalyst
作者:William Wulff、Constantinos Rabalakos
DOI:10.1055/s-0028-1083532
日期:——
An operationally simple method has been developed for the conjugate addition of nitroalkanes to b-nitrostyrene with the use of thiourea catalysis. The reaction affords good yields of syn-1,3- dinitro adducts with only 2% catalyst loading.