Copper-Catalyzed Asymmetric 1,4-Addition of Alkenyl Alanes to N-Substituted-2-3-dehydro-4-piperidones
摘要:
Readily available vinyl alanes are used in the Cu-catalyzed asymmetric conjugate addition reaction to N-substituted-2-3-dehydro-4-piperidones. The enhanced reactivity of recently developed and easily prepared phosphine amine ligands in combination with inexpensive Cu(II)naphtenate (CuNp) allows the introduction of a great variety of alkenyl, alkyl, and aryl aluminums in high enantioselectivity.
A New Entry of Nucleophiles in Rhodium-Catalyzed Asymmetric 1,4-Addition Reactions: Addition of Organozinc Reagents for the Synthesis of 2-Aryl-4-piperidones
A rhodium-catalyzedasymmetric 1,4-addition reaction has been applied to the synthesis of 2-aryl-4-piperidones. While other conventional nucleophiles fail, organozinc reagents have been successfully utilized for the construction of these useful compounds in very good yield and enantiomeric excess.
Enantioselective palladium-catalysed conjugate addition of arylsiloxanes
作者:Francesca Gini、Bart Hessen、Ben L. Feringa、Adriaan J. Minnaard
DOI:10.1039/b616969d
日期:——
The complex formed from Pd(CH3CN)4(BF4)2 and (R,R)-MeDUPHOS is a highly enantioselective catalyst for the asymmetric conjugate addition of aryltriethylsiloxanes to a variety of unsaturated ketones, lactones and lactams.
Asymmetric 1,4-Addition of Arylboronic Acids to 2,3-Dihydro-4-pyridones Catalyzed by Axially Chiral NHC−Pd(II) Complexes
作者:Qin Xu、Rui Zhang、Tao Zhang、Min Shi
DOI:10.1021/jo1006224
日期:2010.6.4
Axiallychiral cis-chelated bidentate bis(N-heterocyclic carbene)−palladium(II) complexes are effective catalysts for the asymmetric conjugate addition of arylboronicacids to 2,3-dihydro-4-pyridones, producing the synthetically and biologically important 2-aryl-4-piperidones in moderate-to-high yields (up to 96%) along with excellent enantioselectivities (up to >99.5% ee) in most cases under mild
Palladium-Catalyzed Enantioselective Conjugate Addition of Arylboronic Acids
作者:Francesca Gini、Bart Hessen、Adriaan J. Minnaard
DOI:10.1021/ol052222d
日期:2005.11.1
[reaction: see text] The first asymmetric palladium-catalyzed conjugate addition of arylboronic acids to alpha,beta-unsaturated aldehydes, ketones, and esters is described. For cyclic substrates, excellent chemo-, regio-, and enantioselectivities are achieved when a Pd(O2CCF3)2/DuPHOS catalyst is applied.
Rhodium-Catalyzed Enantioselective Conjugate Addition of Sodium Tetraarylborates to 2,3-Dihydro-4-pyridones and 4-Quinolones by Using (R,R)-1,2-Bis(tert-butylsulfinyl)benzene as a Ligand
(R,R)-1,2-Bis(tert-butylsulfinyl)benzene as an efficient and simple ligand can be applied in the rhodium-catalyzed asymmetric 1,4-addition of sodiumtetraarylborate reagents to N-substituted 2,3-dihydro-4-pyridones and 4-quinolones. The reactions proceeded smoothly to provide the corresponding adducts in good yields (up to 92%) and excellent enantioselectivities (up to 99% ee) under mild conditions