Palladium-Catalysed Enantioselective Conjugate Addition of Aromatic Amines to α,β-UnsaturatedN-Imides. Effect of the Chelating Moiety
作者:Pim Huat Phua、Johannes G. de Vries、King Kuok (Mimi) Hii
DOI:10.1002/adsc.200505126
日期:2005.11
Palladium-catalysedenantioselectiveadditions of aromaticamines to α,β-unsaturated N-imides 4–6 are reported. The N-substituent of the Michael acceptor appears to have an unusual modulating effect on the amine activity. The effects of introducing different substituents are examined. Overall, the yield and selectivity of the system appear to be less sensitive to environmental effects than previous
Enantioselective Conjugate Addition of Hydrazines to α,β-Unsaturated Imides. Synthesis of Chiral Pyrazolidinones
作者:Mukund P. Sibi、Takahiro Soeta
DOI:10.1021/ja069312d
日期:2007.4.1
This manuscript describes a highlyenantioselectiveconjugate hydrazine addition to α,β-unsaturatedimides. The achiral template used has a significant impact on product enantioselectivity. Reactions at lower temperatures provide a protocol to add substituted hydrazines with selectivity resulting in the formation of a single pyrazolidinone product (>98:2 selectivity). A variety of chiral pyrazolidinones
Synthesis, X-ray, and NMR Studies on Palladium BINAP Complexes Containing Oxazolidinone and Acetylacetonate Anions
作者:Devendrababu Nama、Paul S. Pregosin、Alberto Albinati、Silvia Rizzato
DOI:10.1021/om0700157
日期:2007.4.1
A series of monocationic palladium BINAPcomplexes, [Pd(rac-BINAP)(an oxazolidinone anion)][X] and [Pd(rac-BINAP)(an acetylacetonate anion)][X] (X = a, CF3SO3-; b, BF4-) (9−13), have been synthesized and characterized. A dicationic intermediate, pertinent to the Pd-catalyzed hydroamination reaction, arising from the reaction of the bis-aquo complex [Pd(H2O)2(rac-BINAP)]2(CF3SO3)2 and 1 equiv of an