Regioselective Nickel-Catalyzed Reductive Couplings of Enones and Allenes
作者:Wei Li、Nan Chen、John Montgomery
DOI:10.1002/anie.201004740
日期:2010.11.8
Alkenes made easy: In a complement to coupling processes of terminal alkynes, the reductivecoupling of enones and allenes provides access to conjugate addition products that possess a 1,1‐disubstituted alkene (see scheme; cod=1,5‐cyclooctadiene). The solvent composition and reducing agent must be carefully matched to allow high levels of regioselectivity to be observed.
Synthesis of Alkynes from Vinyl Triflates Using Tetrabutylammonium Fluoride
作者:Masaru Okutani、Yuji Mori
DOI:10.1248/cpb.c15-00146
日期:——
A convenient method for the preparation of alkynes and alkynyl esters from ketones and beta-keto esters is described which involves the formation of vinyltriflates, followed by elimination with tetrabutylammonium fluoride trihydrate, to give alkynes. Unlike established elimination methods, the method requires neither a strong base nor anhydrous conditions.
Ligand exchange reaction of sulfoxides in organic synthesis: A novel method for synthesizing acetylenes and allenes from carbonyl compounds through sulfoxides having a trifluoro-methanesulfonyloxy group on the β-carbon
A novel method for synthesizing acetylenes and allenes from carbonyl compounds is described. Ligand exchange reaction of alkenylsulfoxides having a trifluoromethanesulfonyloxy group on the β-carbon, which were derived from α-alkyl β-ketosulfoxides, with n-BuLi gave disubstituted acetylenes in good yields. In the case of alkenylsulfoxides having both the trifluoromethanesulfonyloxy and aryl groups on