1-(2-Iodophenyl)-1H-tetrazole as a ligand for Pd(II) catalyzed Heck reaction
作者:Arun Kumar Gupta、Chung Hyun Song、Chang Ho Oh
DOI:10.1016/j.tetlet.2004.03.162
日期:2004.5
1-(2-Iodophenyl)-1H-tetrazole 2 was synthesized by the reaction of 2-iodoaniline, sodium azide and triethyl orthoformate in acetic acid. The newly synthesized ligand 2 was successfully used in Heckreaction to give the cross-coupled products in excellent yields.
Rhodium-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Carbonyl Compounds via Thiourea Hydrogen Bonding
作者:Jialin Wen、Jun Jiang、Xumu Zhang
DOI:10.1021/acs.orglett.6b01812
日期:2016.9.16
The strategy of secondary interaction enables enantioselectivity for homogeneous hydrogenation. By introducing hydrogen bonding of substrates with thiourea from the ligand, α,β-unsaturated carbonyl compounds, such as amides and esters, are hydrogenated with high enantiomeric excess. The substrate scope for this chemical transformation is broad with various substituents at the β-position. Control experiments
Pd-Catalyzed desulfitative arylation of olefins by <i>N</i>-methoxysulfonamide
作者:Subhadra Ojha、Niranjan Panda
DOI:10.1039/d1ob02360h
日期:——
A novel Pd-catalyzed protocol for the desulfitative Heck-type reaction of N-methoxy aryl sulfonamides with alkenes was reported. The cross-coupling reaction was performed successfully with a variety of olefins to obtain aryl alkenes. Different substituents on the aromatic ring of N-methoxysulfonamides were also found to be compatible with the reaction conditions. Expectedly, the reaction proceeds through
A new class of readily available and conformationally rigid phosphino-oxazoline ligands for asymmetric catalysis
作者:Duan Liu、Qian Dai、Xumu Zhang
DOI:10.1016/j.tet.2005.03.111
日期:2005.6
A new class of conformationally rigid phosphino-oxazoline ligands 3 were synthesized via an efficient ortho-substitution of phenyl glycinol as the key step. Divergent synthetic routes for easy ligand modulation, as well as a procedure suitable for scale-up synthesis, were established. The catalytic potential of ligands 3 has been demonstrated in the highly enantioselective Ir-catalyzed hydrogenation