Pd-Catalyzed Regioselective Decarboxylative/C–H α-Alkoxyalkenylation of Heterocycles Using α-Carboxyvinylethers
作者:Jean-Baptiste E. Y. Rouchet、Mahmoud Hachem、Cédric Schneider、Christophe Hoarau
DOI:10.1021/acscatal.7b01330
日期:2017.8.4
A direct introduction of vinyl ethers into C-H bond of heterocycles is reported. For this purpose, decarboxylative direct C-H cross-coupling of 1,3-diazoles with alpha-carboxyvinyl ethers as coupling partners was achieved under Pd(0)/Cu(I) cooperative catalysis to produce various alpha-heteroarylated vinylethers. This methodology was applied to the innovative production of heteroarylated enolizable ketones and naturally occurring bis-oxa(thia)zoles.
Enantioselective Hydrogenation of α-Aryloxy and α-Alkoxy α,β-Unsaturated Carboxylic Acids Catalyzed by Chiral Spiro Iridium/Phosphino-Oxazoline Complexes
The iridium-catalyzed highly enantioselectivehydrogenation of alpha-aryloxy and alpha-alkoxy-substituted alpha,beta-unsaturated carboxylic acids was developed. By using chiral spiro phosphino-oxazoline ligands, the hydrogenation proceeded smoothly to produce various alpha-aryloxy- and alpha-alkoxy-substituted carboxylic acids with extremely high enantioselectivities (ee up to 99.8%) and reactivities