Intramolecular Diels–Alder reaction of 1,7,9-decatrienoates catalyzed by indium(III) trifluoromethanesulfonate in aqueous media
作者:Hikaru Yanai、Akio Saito、Takeo Taguchi
DOI:10.1016/j.tet.2005.05.062
日期:2005.7
The intramolecular Diels–Alder reaction of ester-tethered 1,7,9-decatrienoate derivatives in a mixture of water and 2-propanol was catalyzed by indium(III) triflate to give the cycloadducts in good yield with perfect endo-selectivity.
Remarkable rate acceleration of intramolecular Diels–Alder reaction in ionic liquids
作者:Hikaru Yanai、Hiroshi Ogura、Takeo Taguchi
DOI:10.1039/b910488g
日期:——
The intramolecular DielsâAlder reaction of an ester-tethered 1,3,9-decatriene system was significantly accelerated in ionic liquids such as [emim]BF4, [bmim]BF4 and [bdmim]BF4. Under the present conditions, the IMDA reaction proceeded smoothly without the use of Lewis acid catalysts to give cis-fused bicyclic lactones in good yield with high diastereoselectivity.
Intramolecular Diels–Alder (IMDA) reaction of α-fluoroacrylate derivatives 1a–e having 1,7,9-decatrienoate system is efficiently promoted by the novelbidentateLewisacid A generated in situ by mixing 3,3′,5,5′-tetrabromo-1,1′-biphenyl-2,2′-diol (Br4BIPOL, 1 mol) and trimethylaluminum (2 mol). The IMDA reaction of α-fluoroacrylates proceeds via endo-boat transition state as in the case of the corresponding
This paper describes the development of a new family of ionic liquid crystals based on imidazolium salts and their applications as media for intramolecular Diels Alder reactions.
Efficient intramolecular Diels–Alder reactions of ester-tethered 1,7,9-decatrienoates catalyzed by bis-aluminated trifluoromethanesulfonamide
作者:Akio Saito、Hikaru Yanai、Takeo Taguchi
DOI:10.1016/j.tet.2004.10.012
日期:2004.12
Bis-aluminated trifluoromethanesulfonamide generated in situ by mixing TfNH2 (1 mol) and methylaluminum reagent (2 mol) is an effective catalyst for the IMDA reaction of ester-tethered 1,7,9-decatrienoates. (C) 2004 Elsevier Ltd. All rights reserved.