Influence of Lewis Acids on the Diels–Alder Reaction. IV. Reaction of 2-Methyl- and 2-Phenylfuran with Ethyl Propiolate

1971 ◽  
Vol 49 (19) ◽  
pp. 3152-3157 ◽  
Author(s):  
A. W. Mcculloch ◽  
A. G. McInnes
Keyword(s):  
Methyl Acrylate ◽  
Lewis Acids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Methyl Propionate ◽  
Diels Alder Reaction ◽  
By Products

The AlCl3-promoted reactions of 2-methyl- and of 2-phenylfuran with ethyl propiolate afford as major products ethyl 5-hydroxy-2-methyl- and 2-phenylbenzoates (6a, 6b). Also isolated as minor by-products of these reactions are ethyl 3-(2-furyl-5-methyl)acrylate (5a), ethyl 3-(2-furyl-5-phenyl)acrylate (5b), ethyl 3,3-di(2-furyl-5-methyl)propionate (10a), ethyl 3,3-di(2-furyl-5-phenyl)propionate (10b), and ethyl 2-hydroxy-5-methylbenzoate (8a).

An examination of VANOL, VAPOL, and VAPOL derivatives as ligands for asymmetric catalytic Diels–Alder reactions

2006 ◽  
Vol 84 (10) ◽  
pp. 1487-1503 ◽  
Author(s):  
Douglas P Heller ◽  
Daniel R Goldberg ◽  
Hongqiao Wu ◽  
William D Wulff
Keyword(s):  
Asymmetric Catalysis ◽  
Methyl Acrylate ◽  
Lewis Acids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Asymmetric Catalytic ◽  
Diels Alder Reaction ◽  
Positive Cooperativity ◽  
Derivatives Of ◽  
Methyl Phenyl

Several derivatives of the vaulted biaryl ligand VAPOL were prepared and evaluated as chiral ligands for aluminum Lewis acids in the catalytic asymmetric Diels–Alder reactions of methyl acrylate and methacrolein with cyclopentadiene. The substituents on VAPOL were introduced into the 6- and 6′-positions in an effort to further extend the chiral pocket of the major groove, which contains the phenol functions at the 4- and 4′-positions. The set of four new ligands that have been prepared have the following groups introduced into the 6- and 6′-positions of VAPOL: bromide, methyl, phenyl and 3,5-di-t-butylphenyl. All of these ligands give lower asymmetric inductions than the unsubstituted VAPOL for the Diels–Alder reactions of both methyl acrylate and methacrolein. The positive cooperativity of added carbonyl compounds on the autoinduction in the Diels–Alder reaction of methyl acrylate and cyclopentadiene were also investigated with the VANOL and VAPOL ligands as well as the 6,6′-dibromo and 6,6′-diphenyl derivatives of VAPOL. Only the reaction with VAPOL showed any significant positive cooperativity. The reaction with VANOL was sluggish at –78 °C, but at higher temperatures, the reaction did exhibit positive cooperativity that was similar to that of VAPOL. Finally, no positive cooperativity was observed with the VAPOL ligand for the reaction of methacrolein and cyclopentadiene.Key words: Diels–Alder, asymmetric catalysis, vaulted biaryl ligands, VANOL, VAPOL.

Influence of Lewis Acids on the Diels–Alder Reaction. VI. Reaction of 2,5-Dimethyl- and 2,5-Diphenylfuran with Ethyl Propiolate

1974 ◽  
Vol 52 (1) ◽  
pp. 143-150 ◽  
Author(s):  
A. W. McCulloch ◽  
A. G. McInnes
Keyword(s):  
Lewis Acids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
By Products

The AlCl3-promoted reactions of 2,5-dimethyl- and of 2,5-diphenylfuran with ethyl propiolate afford as major products ethyl 2,6-dimethyl-3-hydroxybenzoate (6a) and ethyl 3,5-diphenyl-2-hydroxybenzoate (8b), respectively. Also isolated from these reactions were ethyl 2,4-dimethyl-5-hydroxybenzoate (7a), ethyl 3,5-dimethyl-2-hydroxybenzoate (8a), ethyl 2,4-diphenyl-5-hydroxybenzoate (7b), and ethyl 2,6-diphenyl-3-hydroxybenzoate (6b). Minor by-products were trans ethyl 3-(2,5-dimethyl-3-furyl-acrylate (10) and ethyl 3-acetyl-2-(2,5-dimethyl-3-furyl)-5-methyl-cyclopenta-2,5-dienecarboxylate (11).

Chiral Lewis Acids as Enantioselective Catalysts in the Diels-Alder Reaction and the Allylic Addition to Aldehydes

1990 ◽  
Vol 45 (12) ◽  
pp. 1684-1688 ◽  
Author(s):  
Andreas Ketter ◽  
Rudolf Herrmann
Keyword(s):  
Methyl Acrylate ◽  
Lewis Acids ◽  
Enantiomeric Excess ◽  
Alder Reaction ◽  
Diels Alder ◽  
Chelating Ligands ◽  
Diels Alder Reaction ◽  
Enantioselective Reactions ◽  
Enantioselective Catalysts

The efficiency of chiral Lewis acids derived from TiCl4 or Al(Bui)2Cl with chiral chelating ligands as catalysts for some enantioselective reactions was evaluated. The Diels-Alder reaction between isoprene and methyl acrylate gave the cyclohexene derivative with up to 32% enantiomeric excess (e. e.). The reaction of 3-methylbutanal with allyltrimethylsilane led to 6-methylhept-1-en-4-ol with up to 36% e. e.

Influence of Lewis acids on the Diels–Alder reaction. III. Rearrangement of dimethyl N-carbomethoxy-7-azabicyclo[2.2.1]2,5-heptadiene-2,3-dicarboxylate adducts to dimethyl N-carbomethoxy-3-aminophthalates

1970 ◽  
Vol 48 (9) ◽  
pp. 1472-1474 ◽  
Author(s):  
R. C. Bansal ◽  
A. W. McCulloch ◽  
A. G. McInnes
Keyword(s):  
Aluminum Chloride ◽  
Lewis Acids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Prolonged Treatment ◽  
Dimethyl Acetylenedicarboxylate ◽  
Diels Alder Reaction ◽  
Convenient Route

Aluminum chloride accelerates the Diels–Alder reactions of 2- or 2,5-substituted N-carbomethoxypyrroles with dimethyl acetylenedicarboxylate, and also catalyzes rearrangement of the N-carbomethoxy-7-azanorbornadiene adducts to 6- and 4,6-substituted dimethyl N-carbomethoxy-3-aminophthalates. Aromatization of the corresponding adduct of N-carbomethoxypyrrole only occurs on prolonged treatment with BF3. The procedure promises to be a convenient route for the synthesis of polysubstituted anilines.

The diels-alder reaction of cyclopentadiene and methyl acrylate on γ,-alumina

1990 ◽  
Vol 31 (38) ◽  
pp. 5433-5436 ◽  
Author(s):  
George Hondrogiannis ◽  
Richard M Pagni ◽  
George W Kabalka ◽  
Peter Anosike ◽  
Robert Kurt
Keyword(s):  
Methyl Acrylate ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction

scholarly journals Diels-Alder Reaction of 1, 3-p-Menthadiene with Methyl Acrylate

1971 ◽  
Vol 92 (5) ◽  
pp. 437-440 ◽  
Author(s):  
Yoshiharu MATSUBARA ◽  
Wasaku MINEMATSU ◽  
Takao KISHIMOTO
Keyword(s):  
Methyl Acrylate ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction
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