Switch in Selectivity for Formal Hydroalkylation of 1,3‐Dienes and Enynes with Simple Hydrazones
作者:Leiyang Lv、Lin Yu、Zihang Qiu、Chao‐Jun Li
DOI:10.1002/anie.201915875
日期:2020.4.16
anti-Markovnikov addition is obtained by changing to a ruthenium catalyst, thus providing direct and efficient access to homoallylic products exclusively. Isotopic substitution experiments indicate that no reversible hydro-metallation across the metal-π-allyl system occurred under ruthenium catalysis. Moreover, this protocol is applicable to the regiospecific hydroalkylation of the distal C=C bond of 1,3-enynes
Cleavage of Carbon–Carbon Triple Bond: Direct Transformation of Alkynes to Nitriles
作者:Noriko Okamoto、Minoru Ishikura、Reiko Yanada
DOI:10.1021/ol401311h
日期:2013.6.7
A new cleavage reaction of carbon–carbon triple bonds proceeds efficiently with NIS and TMSN3, giving the corresponding nitriles in moderate to good yields.
NIS和TMSN 3可以有效地进行碳-碳三键的新裂解反应,从而以中等至良好的产率获得相应的腈。
Transmetalation of Alkylzirconocenes in Copper-Catalyzed Alkyl-Alkynyl Cross-Coupling Reactions
作者:Kiran Indukuri、Olivier Riant
DOI:10.1002/adsc.201700164
日期:2017.7.17
simple copper‐catalyzed alkyl–alkynyl cross‐coupling strategy has been developed using the reaction between alkynyl bromides and alkylzirconocenes. The alkylzirconocenes were generated in situ via regioselective addition of Schwartz's reagent (ZrCp2HCl) on to alkenes. The reaction has a broad scope, a range of functionalized bromoalkynes and alkylzirconium reagents were successfully coupled, resulting in
Ligand-controlled regioselective palladium-catalyzed decarboxylative hydrogenolysis of propargylic formates is described. A wide range of allenes and alkynes were obtained by using either 1,2-diphenylphosphinoethane (DPPE) or 1,6-bisdiphenylphosphinohexane (DPPH) as a catalyst ligand.
Diastereodivergent Reductive Cross Coupling of Alkynes through Tandem Catalysis: <i>Z</i>- and <i>E</i>-Selective Hydroarylation of Terminal Alkynes
作者:Megan K. Armstrong、Madison B. Goodstein、Gojko Lalic
DOI:10.1021/jacs.8b05113
日期:2018.8.15
diastereodivergent hydroarylation of terminal alkynes is accomplished using tandem catalysis. The hydroarylation allows highly selective synthesis of both E and Z diastereoisomers of aryl alkenes, from the same set of starting materials, using the same combination of palladium and copper catalysts. The selectivity is controlled by simple changes in the stoichiometry of the alcohol additive. The hydroarylation has