The intramolecular tandem Michael/Mannich-type reaction of α,β-unsaturated carbonyl compounds with acyliminium ions provides access to chiral indolizidines
摘要:
The intramolecular tandem Michael/Mannich-type (Michael addition/halo-Mannicli-type) reaction using TiCl4/n-BU(4)Nl system between the alpha,beta-unsaturated carbonyl compounds possessing an Evans oxazolidinone as a chiral auxiliary and N-acyliminium ion intermediates is described. The reaction was promoted in a mixed solvent of AcOEt-CH2O2 to afford indolizidine compounds with three stereogenic centers. (C) 2007 Elsevier Ltd. All rights reserved.
The intramolecular tandem Michael/Mannich-type reaction of α,β-unsaturated carbonyl compounds with acyliminium ions provides access to chiral indolizidines
摘要:
The intramolecular tandem Michael/Mannich-type (Michael addition/halo-Mannicli-type) reaction using TiCl4/n-BU(4)Nl system between the alpha,beta-unsaturated carbonyl compounds possessing an Evans oxazolidinone as a chiral auxiliary and N-acyliminium ion intermediates is described. The reaction was promoted in a mixed solvent of AcOEt-CH2O2 to afford indolizidine compounds with three stereogenic centers. (C) 2007 Elsevier Ltd. All rights reserved.
The intramolecular tandem Michael/Mannich-type reaction of α,β-unsaturated carbonyl compounds with acyliminium ions provides access to chiral indolizidines
The intramolecular tandem Michael/Mannich-type (Michael addition/halo-Mannicli-type) reaction using TiCl4/n-BU(4)Nl system between the alpha,beta-unsaturated carbonyl compounds possessing an Evans oxazolidinone as a chiral auxiliary and N-acyliminium ion intermediates is described. The reaction was promoted in a mixed solvent of AcOEt-CH2O2 to afford indolizidine compounds with three stereogenic centers. (C) 2007 Elsevier Ltd. All rights reserved.