Regioselective Rhodium-Catalyzed Addition of 1,3-Dicarbonyl Compounds to Terminal Alkynes
作者:Thorsten M. Beck、Bernhard Breit
DOI:10.1021/acs.orglett.5b03391
日期:2016.1.4
A new method for the rhodium-catalyzed regioselective C–C bond formation using terminal alkynes and 1,3-dicarbonyl compounds to achieve valuable branched α-allylated 1,3-dicarbonyl products is reported. With a Rh(I)/DPEphos/p-CF3-benzoic acid as the catalyst system, the desired products can be obtained in good to excellent yields and with perfect regioselectivity. A broad range of functional groups
Chromium‐Catalyzed Selective Dimerization/Hydroboration of Allenes to Access Boryl‐Functionalized Skipped (
<i>E</i>
,
<i>Z</i>
)‐Dienes
作者:Yinsong Zhao、Shaozhong Ge
DOI:10.1002/anie.202012344
日期:2021.1.25
dimerization/hydroboration of allenes is developed to access synthetically versatile boryl‐functionalized skippeddienes with a catalyst generated in situ from CrCl2 and a pyridine‐2,6‐diimine ligand mesPDI. A variety of allenes reacted with pinacolborane (HBpin) to afford the corresponding boryl‐functionalized (E,Z)‐1,4‐dienes in high yields and with excellent selectivity. Electron paramagnetic resonance (EPR) spectroscopic
Gold-Catalyzed Regioselective Dimerization of Aliphatic Terminal Alkynes
作者:Liming Zhang、Sheng Sun、Julien Kroll、Yingdong Luo
DOI:10.1055/s-0031-1289567
日期:2012.1
A gold-catalyzed regioselective homodimerization of aliphatic terminal alkynes is described. Bulky and less Lewis acidic t-BuXPhosAuNTf2 is the preferred catalyst, and the additive, anhydrous NaOAc, substantially facilitates the reaction.
Pinacol as a New Green Reducing Agent: Molybdenum- Catalyzed Chemoselective Reduction of Sulfoxides and Nitroaromatics
作者:Nuria García、Patricia García-García、Manuel A. Fernández-Rodríguez、Rubén Rubio、María R. Pedrosa、Francisco J. Arnáiz、Roberto Sanz
DOI:10.1002/adsc.201100877
日期:2012.2
Pinacol is disclosed as a newchemoselective and environmentally benign reducing agent for sulfoxides and nitroaromatics assisted by readily available dichlorodioxomolybdenum(VI) complexes as catalysts. A wide range of substrates including those bearing challenging functional groups has been efficiently and selectively reduced with acetone and water being the only by-products of these reactions.
reacting alkynylmanganese compounds with acyl chlorides. The procedure is especially useful for preparing polyfunctionalized and polyunsaturated α,β-acetylenic ketones. organomanganese - acylation - acetylenic ketones - acyl chlorides