Pd(II)-Bipyridine Catalyzed Conjugate Addition of Arylboronic Acid to α,β-Unsaturated Carbonyl Compounds
作者:Xiyan Lu、Shaohui Lin
DOI:10.1021/jo051561h
日期:2005.11.1
A Pd(II)-catalyzed conjugate addition of arylboronicacid to α,β-unsaturated ketones, aldehydes, esters, etc. in the presence of 2,2‘-bipyridine was developed. A mechanism involving transmetalation, insertion of the carbon−carbon double bond into the C−Pd bond, and protonolysis of the resulting C−Pd bond is proposed. The reaction conditions are mild and the yield is high. The presence of 2,2‘-bipyridine
Palladium–bipyridine catalyzed conjugate addition of arylboronic acids to α,β-unsaturated carbonyl compounds in aqueous media
作者:Shaohui Lin、Xiyan Lu
DOI:10.1016/j.tetlet.2006.07.154
日期:2006.10
Palladium/bipyridine catalyzed conjugate addition of arylboronic acids to α,β-unsaturated carbonylcompounds in aqueous media was developed with high yields.
以高收率开发了钯/联吡啶将芳基硼酸共轭加成到水性介质中的α,β-不饱和羰基化合物上。
Palladium-Catalyzed Conjugate Addition of Organosiloxanes to α,β-Unsaturated Carbonyl Compounds and Nitroalkenes
作者:Scott E. Denmark、Nobuyoshi Amishiro
DOI:10.1021/jo034763r
日期:2003.9.1
aryltrialkoxysilanes to alpha,beta-unsaturated carbonylcompounds (ketones, aldehydes) and nitroalkenes in the presence of SbCl(3), TBAF, AcOH, and a catalytic amount of Pd(OAc)(2), in CH(3)CN at 60 degrees C, provides the corresponding conjugate addition products in moderate to good yields. The addition of equimolar amounts of SbCl(3) and TBAF is necessary for this reaction to proceed smoothly. The arylpalladium
Palladium(II)-Catalyzed Conjugate Addition of Arylsiloxanes in Water
作者:Rachel Lerebours、Christian Wolf
DOI:10.1021/ol071067v
日期:2007.7.1
Palladium-phosphinous acids catalyze the conjugateaddition of arylsiloxanes to a wide range of alpha,beta-unsaturated substrates in water. A microwave-assisted procedure is described that uses 5 mol % of POPd1 to afford beta-substituted ketones, aldehydes, esters, nitriles, and nitroalkanes in 83% to 96% yield within 4 h. This method eliminates the need for stoichiometric additives and an excess of
Iridium-catalyzed highly chemoselective and efficient reduction of nitroalkenes to nitroalkanes in water
作者:Dong Xu、Yang Chen、Changmeng Liu、Jiaxi Xu、Zhanhui Yang
DOI:10.1039/d1gc01907d
日期:——
An iridium-catalyzed highly chemoselective and efficient transfer hydrogenation reduction of structurally diverse nitroalkenes was realized at very low catalyst loading (S/C = up to 10000 or 20 000), using formic acid or sodium formate as a traceless hydride donor in water. Excellent functionality tolerance is also observed. The turnover number and turnover frequency of the catalyst reach as high as
在非常低的催化剂负载量(S/C = 高达 10000 或 20 000)下,使用甲酸或甲酸钠作为水中的无痕氢化物供体,实现了铱催化的高化学选择性和高效转移氢化还原结构多样的硝基烯烃。还观察到优异的功能耐受性。催化剂的周转次数和周转频率高达18 600和19 200 h -1, 分别。不需要惰性气氛保护。硝基烯烃的反应性取决于它们的取代模式,pH 值是实现完全转化和优异化学选择性的关键因素。产品的纯化通过简单的萃取实现,无需柱层析。还原过程在 10 000 S/C 比率下轻松放大到 10 g 规模。这种绿色还原在对映选择性氢化中的潜力已经得到证实。