Chiral [2.2.2] Dienes as Ligands for Rh(I) in Conjugate Additions of Boronic Acids to a Wide Range of Acceptors
作者:Christian Defieber、Jean-François Paquin、Sonia Serna、Erick M. Carreira
DOI:10.1021/ol048240x
日期:2004.10.1
[reaction: see text] We document a series of investigations that led to new substituted [2.2.2]-diene ligands which display high selectivity in Rh(I)-catalyzed conjugate addition reactions to substrates not previously examined with diene ligands. Moreover, we disclose an unexpected, interesting effect that results from the introduction of a third C=C onto the ligand scaffold (cf. 1).
α,β-Divinyl Tetrahydropyrroles as Chiral Chain Diene Ligands in Rhodium(I)-Catalyzed Enantioselective Conjugated Additions
作者:Qian Li、Zhe Dong、Zhi-Xiang Yu
DOI:10.1021/ol103152t
日期:2011.3.4
A series of α,β-divinyl tetrahydropyrroles, synthesized by asymmetric allylic C−H bond activation/conjugated diene addition reaction of ene-2-dienes, were found to be very efficient chiral chain diene ligands in the rhodium-catalyzedconjugatedaddition of organoboronic acids to various α,β-unsaturated compounds, achieving the desired chiral adducts with good to excellent yields and ee values.
High Efficiency and Enantioselectivity in the Rh-Catalyzed Conjugate Addition of Arylboronic Acids Using Monodentate Phosphoramidites
作者:Jean-Guy Boiteau、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo035155e
日期:2003.11.1
A very fast reaction and enantioselectivities >98% have been reached in the rhodium-catalyzed arylboronic acid addition to enones using a monodentate phosphoramidite ligand. Temperature-dependent studies show that monodentate phosphoramidites form stable complexes with metals and can induce high enantioselectivities even at high temperatures in polar solvents.
A Class of Benzene Backbone-Based Olefin–Sulfoxide Ligands for Rh-Catalyzed Enantioselective Addition of Arylboronic Acids to Enones
作者:Feng Xue、Xincheng Li、Boshun Wan
DOI:10.1021/jo2011472
日期:2011.9.2
A class of readily available and easily tunable benzene backbone-based olefin–sulfoxide ligands was developed for the rhodium-catalyzed asymmetric conjugateaddition reaction of arylboronic acids to enones with up to 97% yield and 97% ee.
Sulfoxide–Alkene Hybrids: A New Class of Chiral Ligands for the Hayashi–Miyaura Reaction
作者:Tobias Thaler、Li-Na Guo、Andreas K. Steib、Mihai Raducan、Konstantin Karaghiosoff、Peter Mayer、Paul Knochel
DOI:10.1021/ol200841x
日期:2011.6.17
Sulfoxide-alkene hybrids are introduced as a new class of chiral heterodentate ligands for the Hayashi-Miyaura reaction. The synthesis of these ligands was achieved without the use of protecting groups. A chiral resolution was performed via simple column-chromatographic separation of the diastereomeric ligands. Both diastereomers proved to be excellent ligands In Rh-catalyzed 1,4-addition reactions, furnishing chiral Products with high enantloselectivities and, remarkably, opposite stereoconfigurations.