Catalytic Asymmetric Hiyama Cross-Couplings of Racemic α-Bromo Esters
作者:Xing Dai、Neil A. Strotman、Gregory C. Fu
DOI:10.1021/ja8009428
日期:2008.3.1
The first catalyticasymmetriccross-coupling of α-halo carbonyl compounds with aryl metal reagents has been developed, thereby generating synthetically useful α-aryl carboxylic acid derivatives in good enantiomeric excess. The method can also be applied to enantioselective alkenylation reactions.
Pd-catalyzed desulfitative Hiyama coupling with sulfonyl chlorides
作者:Wei Zhang、Fang Liu、Ke Li、Baoli Zhao
DOI:10.1002/aoc.3139
日期:2014.5
Palladium‐catalyzed desulfitativeHiyama cross‐coupling reactions of various arylsulfonyl chlorides with aryltriethoxysilane have been achieved in good yields. The reported cross‐coupling reactions are tolerant to the common functional groups regardless of electron‐withdrawing or electron‐donating, making these transformations attractive alternatives to the traditional cross‐coupling approaches. Copyright
β-C(sp3)–H bonds of propioamides with organosilanes is described. The reaction proceeds with the assistance of an 8-aminoquinolyl auxiliary in a tandem way by the first oxidation of β-C(sp3)–H bonds and subsequent arylation/vinylation to give the aryloxylation/vinyloxylation products. This unusual aryloxy/vinyloxy forming reaction offers a new avenue for the functionalization of unactivated sp3 C–H
A palladium-catalyzed Mizoroki-Heck-type reaction of aryl trimethoxysilanes with olefins is described. A series of ArSi(OMe)3 and olefins, including electron-rich and electron-deficient analogues worked well in the procedure, affording the arylation products in moderate to good yields.