<scp>Palladium‐Catalyzed</scp>
Decarboxylative Homodimerization of Propiolic Acids: Synthesis of 1,
<scp>3‐Enynes</scp>
作者:Eunkyeong Seo、Jonghoon Oh、Sunwoo Lee
DOI:10.1002/bkcs.12221
日期:2021.3
was obtained as a result of a decarboxylative homodimerization reaction when a variety aryl propiolicacids were reacted in the presence of Pd(TFA)2/i‐PrPPh2 and K2CO3. It was found that aryl propiolicacids bearing an electrondonating substituent provided the desired product; however, aryl propiolicacids an bearing electron‐withdrawing substituent did not give the desired product.
当各种芳基丙酸在Pd(TFA)2 / i-PrPPh2和K 2 CO 3存在下反应时,通过脱羧均二聚反应获得1,3-烯炔产物。发现带有电子给体取代基的芳基丙酸提供了所需的产物。但是,带有轴承吸电子取代基的芳基丙酸不能提供所需的产物。
One-Pot Desilylation/Dimerization of Terminal Alkynes by Ruthenium and Acid-Promoted (RAP) Catalysis
作者:Chiara Pasquini、Mauro Bassetti
DOI:10.1002/adsc.201000347
日期:2010.10.4
promoted by the (p-cymene)ruthenium dichloride dimer/acetic acid system [RuCl2(p-cymene)]2/AcOH} can be performed starting from the trimethylsilylethynyl derivatives (12 substrates), deprotected in situ, to afford 1,4-disubstituted 1-en-3-ynes with high regio- and (E)-stereoselectivity, at room temperature. The extension of this unprecedented two-reaction sequence to a diyne substrate affords a fluorene-based
Regioselective hydrations of 1-aryl-3-en-1-ynes using gold and platinum catalysts: selective production of 2-en-1-ones and 3-en-1-ones
作者:Bhanudas Dattatray Mokar、Rai-Shung Liu
DOI:10.1039/c4cc02786h
日期:——
Regiocontrolled hydrations of 1-aryl-3-en-1-ynes have been accomplished with IPrAuOTf and PtCl2/CO to yield 3-en-1-ones and 2-en-1-ones efficiently; our experimental data indicates that the sizes of catalysts play an important role.
Ligand‐Controlled Diastereoselective Cobalt‐Catalysed Hydroalkynylation of Terminal Alkynes to
<i>E</i>
‐ or
<i>Z</i>
‐1,3‐Enynes
作者:Sebastian M. Weber、Jona Queder、Gerhard Hilt
DOI:10.1002/chem.202001697
日期:2020.9.21
A diastereoselectivehydroalkynylation of terminalalkynes to form the head‐to‐head dimerization products by two different cobalt‐phosphine catalyst system is reported. The use of the bidentate ligand dppp and additional triphenylphosphine led to the selective formation of the (E)‐1,3‐enynes (E:Z>99:1) in good to excellent yields, while the tridentate ligand TriPhos led to the corresponding (Z)‐1,3‐enynes