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
Dimerization of Terminal Arylalkynes in Aqueous Medium by Ruthenium and Acid Promoted (RAP) Catalysis: Acetate‐ Assisted (
<i>sp</i>
)C(
<i>sp</i>
<sup>2</sup>
)C Bond Formation
作者:Alessandra Coniglio、Mauro Bassetti、Sergio E. García‐Garrido、José Gimeno
DOI:10.1002/adsc.201100600
日期:2012.1
3‐HO(CH2CH2O)3‐C6H4] in acetic acid/water mixture (1:1, v/v). The reactions proceed for 24 h at room temperature under heterogeneous conditions and afford the dimeric enyne derivatives (E)‐ArCHCHCCAr in high yields and stereoselectivity. The preformed acetato complex [RuCl(η6‐C6Me6)(κ2‐OAc)] catalyzes the dimerization of phenylacetylene under analogous conditions, with rapid substrate conversion. The
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