Catalytic Enantioselective Synthesis of 1,4‐Keto‐Alkenylboronate Esters and 1,4‐Dicarbonyls
作者:Michael Z. Liang、Simon J. Meek
DOI:10.1002/anie.201907757
日期:2019.10
catalytic enantioselective method for the synthesis of 1,4-keto-alkenylboronate esters by a rhodium-catalyzed conjugate addition pathway is disclosed. A variety of novel, bench-stable alkenyl gem-diboronate esters are synthesized. These easily accessible reagents react smoothly with a collection of cyclic α,β-unsaturatedketones, generating a new C-C bond and stereocenter. Products are isolated in up to
Electronically deficient ( Rax , S , S )-F 12 -C 3 -TunePhos and its applications in asymmetric 1,4-addition reactions
作者:Shu-Bo Hu、Zhang-Pei Chen、Ji Zhou、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2016.03.072
日期:2016.4
diphosphine ligand (Rax,S,S)-F12-C3-TunePhos has been concisely synthesized. The electron-poor ligand features both chiral centers and chiral axis bearing fluoro-functional groups on each phosphorus phenyl ring based on C3-TunePhos backbone. The catalyst composed of this ligand and rhodium showed excellent activities and enantioselectivities in asymmetric 1,4-addition reactions of arylboronic acids to
Asymmetric 1,4-Addition of Organoboron Reagents to Quinone Monoketals Catalyzed by a Chiral Diene/Rhodium Complex: A New Synthetic Route to Enantioenriched 2-Aryltetralones
作者:Norihito Tokunaga、Tamio Hayashi
DOI:10.1002/adsc.200600632
日期:2007.3.5
A novel synthetic approach to 2-aryltetralones with high ee has been developed through asymmetric 1,4-addition of arylboronic acids to naphthoquinone monoketals catalyzed by a rhodium complex with the (R,R)-Ph-bod* ligand. The asymmetric addition proceeded in high yields with excellent enantioselectivity.
Polycyclic Hydroxyquinones. Part 29. Regioselective Reactions of 5-sulphur-substituted furan-2(5H)-one anions with naphthoquinone monoketals. Application to the synthesis of anthracyclinone precursors
afford exclusively the C-5 substituted Michael adducts in good yield. The annelation reactions of the anions generated from furanones 30 and 33 with naphthoquinone monoketals 11 and 12 lead to 2-sulphur-substituted 1,4-anthraquinones 32, 35 and 36. Diels-Alder reaction of the 1,4-anthraquinones 41 and 42 with (E)-1,3-bis[(trimethylsilyl)oxy]buta-1,3-diene (37) affords ABCD tetracyclic systems related
The first enantioselectivetotalsyntheses of engelharquinone (2) and its epoxide 3 have been achieved. The key steps include (1) catalytic asymmetric 1,4-addition of a naphthylboronic acid derivative to a masked naphthoquinone derivative by using a chiral Rh-complex and (2) thiolate-promoted stereospecific construction of the bicyclo[3.2.1]octadienone scaffold.