Reductive Decarboxylative Alkynylation of
<i>N</i>
‐Hydroxyphthalimide Esters with Bromoalkynes
作者:Liangbin Huang、Astrid M. Olivares、Daniel J. Weix
DOI:10.1002/anie.201706781
日期:2017.9.18
A new method for the synthesis of terminal and internal alkynes from the nickel‐catalyzed decarboxylative coupling of N‐hydroxyphthalimide esters and bromoalkynes is presented. This reductivecross‐electrophilecoupling is the first to use a C(sp)−X electrophile, and appears to proceed via an alkynylnickel intermediate. The internal alkyne products are obtained in yields of 41–95 % without the need
Palladium-Catalyzed Conjugate Addition of Terminal Alkynes to Enones
作者:Lara Villarino、Rebeca García-Fandiño、Fernando López、José L. Mascareñas
DOI:10.1021/ol300988n
日期:2012.6.15
A practical protocol for the hydroalkynylation of enones using Pd catalysis is reported. The reaction proceeds efficiently with a variety of alkynes as well as with several cyclic and acyclic enones, providing synthetically relevant β-alkynyl ketones in good to excellent yields.
A Rhodium-Catalyzed Tandem Alkyne Dimerization/ 1,4-Addition Reaction
作者:Ronald V. Lerum、Christopher M. Russo、Jocellie E. Marquez、John D. Chisholm
DOI:10.1002/adsc.201300743
日期:2013.11.25
AbstractA convenient three‐component coupling reaction for the construction of conjugated enynes using rhodium catalysis is reported. Dimerization of a monosubstituted alkyne followed by trapping of the vinyl metal intermediate with an electron‐deficient alkene, such as methyl vinyl ketone, provided moderate to good yields of these enynes. The use of the hindered electron‐rich tris(ortho‐tolyl)phosphine as a ligand for the rhodium catalyst provided the best conversions to these complex products.magnified image