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.
Regioselective Rhodium-Catalyzed Addition of 1,3-Dicarbonyl Compounds to Terminal Alkynes
作者:Thorsten M. Beck、Bernhard Breit
DOI:10.1021/acs.orglett.5b03391
日期:2016.1.4
A new method for the rhodium-catalyzed regioselective C–C bond formation using terminal alkynes and 1,3-dicarbonyl compounds to achieve valuable branched α-allylated 1,3-dicarbonyl products is reported. With a Rh(I)/DPEphos/p-CF3-benzoic acid as the catalyst system, the desired products can be obtained in good to excellent yields and with perfect regioselectivity. A broad range of functional groups
Efficient Metal-Catalyzed Direct Benzylation and Allylic Alkylation of 2,4-Pentanediones
作者:Magnus Rueping、Boris J. Nachtsheim、Alexander Kuenkel
DOI:10.1021/ol063048b
日期:2007.3.1
[reaction: see text] A highly effective metal-catalyzed benzylation and allylic alkylation of 2,4-pentanediones has been developed. This new bismuth-catalyzed direct carbon-carbon bond forming reaction provides the corresponding monoalkylated dicarbonyl compounds in high yields after short reaction times using the lowest amounts of catalyst (1 mol %) and the free alcohol. In addition, a new route to
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。
Regioselective Rhodium-Catalyzed Addition of β-Keto Esters, β-Keto Amides, and 1,3-Diketones to Internal Alkynes
作者:Thorsten M. Beck、Bernhard Breit
DOI:10.1002/ejoc.201601230
日期:2016.12
The first rhodium-catalyzed regioselective addition of 1,3-dicarbonyl compounds, including β-keto esters, β-keto amides, and 1,3-diketones, to internal alkynes furnishes branched allylic compounds. By applying RhI/DPEphos/TFA as the catalytic system, aliphatic as well as aromatic internal methyl-substituted alkynes act as suitable substrates to yield valuable branched α-allylated 1,3-dicarbonyl compounds
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).