Diastereoselective synthesis of 4,5-dihydrofurans by iodoenolcyclisation of 2-allyl-1,3-dicarbonyl compounds
摘要:
A study of the stereochemical aspects of I-2-induced cyclisation of 2-alkenyl-1,3-dicarbonyl compounds reveals that the iodoenolcyclisation is strictly dependent on the dicarbonyl species and the substituents in the allylic position. (C) 2002 Elsevier Science Ltd. All rights reserved.
Pentane-2,4-dione with allylic alcohols or benzyl alcohol with palladium catalysts gives high yields of C-monoalkylated diketones, arising mainly from reaction at the terminal end of the allyic system for alkyl monosubstituted allyl alcohols. The effect of the catalyst on the alcohols has been evaluated; rearrangements and disproportionations have been observed.
Copper(I) promoted CC bond forming reactions: direct activation of allyl alcohols
作者:Jubaraj.B. Baruah、Ashoka G. Samuelson
DOI:10.1016/0022-328x(89)87015-9
日期:1989.2
Allylic alcohols, acetates, carbonates and chlorides can be activated by copper(I) salts towards nucleophilic substitution by carbon nucleophiles under relatively mild conditions.
烯丙醇,乙酸盐,碳酸盐和氯化物可以在相对温和的条件下被铜(I)盐活化,以被碳亲核试剂亲核取代。
Allyation of carbonucleophiles with allylic carbonates under neutral conditions catalyzed by rhodium complexes
作者:Jiro Tsuji、Ichiro Minami、Isao Shimizu
DOI:10.1016/s0040-4039(01)81551-3
日期:——
Rhodium-phosphine complexes catalyze the allylation of carbonucleophiles with allylic carbonates under neutral conditions. In addition, we found unusual regioselectivity in the rhodium catalyzed allylation.
Influence du cuivre sur la substitution des énolates stables par divers halogénures allyliques
作者:Thérèse Cuvigny、Marc Julia
DOI:10.1016/s0022-328x(00)98920-4
日期:1987.9
The allylic substitution, by a variety of allylic halides, of stable enolates derivedfrom diethyl malonate, ethyl cyanoacetate, ethyl acetoacetate and acetylacetone has been investigated. The yields and regioselectivity of these reactions are strongly influenced by cuprous ions (and their ligands).
Palladium-catalyzed Reactions of 1,3-Dienes with Active Methylene Compounds. IV. Palladium-diphosphine Complex Catalysts
作者:Kuniyuki Takahashi、Akihisa Miyake、Go Hata
DOI:10.1246/bcsj.45.1183
日期:1972.4
Activemethylenecompounds, such as acetylacetone and ethyl acetoacetate, reacted with 1,3-butadiene in the presence of palladium-diphosphine complex catalysts to yield two 1 : 1 adducts, 1 and 2. Primary and secondary amines also afforded two 1 : 1 adducts, 10 and 11. Isoprene, 1,3-pentadiene, and 2,4-hexadiene also reacted with the activemethylenecompounds and the amines in a manner similar to