The steric and electronic influences of.subs.ituen 'j attached to he arbonyl system on the success of the reaction o 1 1,2-$lketones with $imethyl 3-ketoglutarate 2. have been examined. It is clear from the reaction of 2 with benzil, thienil. furil. and phenanthrenequinone 1. respectively, coupled
Reaction of dicarbonyl compounds with dimethyl 3-ketoglutarate. Influence of steric effects on success of the condensation
โ Scribed by K. Avasthi; M.N. Deshpande; Wen-Ching Han; J.M. Cook; U. Weiss
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- French
- Weight
- 249 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
The influence of steric factors on the synthesis of substituted bicyclo[3.3.01octane-3,7 drones via the condensation of 1,2-dicarbonyl compounds with dimethyl 3-ketoglutarate 2 is described.
Recently Bertz reported a new approach to synthetic analysis la,lb which employs graph theory and information theory in order to evaluate alternate synthetic routes toward a common target.
In this vein, the generation of molecular complexity In the polyquinane area & reaction of 1 with 2 (Scheme I) compared favorably with the formation of complex polycyclic molecules composed of six-membered rings formed by the Diels-Alder2 reaction. This is 1~1 agreement with our earlier view on the condensation. 3
๐ SIMILAR VOLUMES
We have reported earlier2$3 that reaction of dimethyl B-ketoglutarate (\_I) with glyoxal (2) in slightly acidic aqueous solution at room-temperature yields a precipitate of cyclic Bketo esters, Acid-catalyzed hydrolysis and decarboxylation of these intermediates gave bicyclo-
The enol content and equilibrium free energies for the keto-enol tautomerism have been determined for a series of 1,3-diketones, at 40 OC, in deuterochloroform and dimethylsulfoxide-d (DMSO), by lH n.m.r.. Compounds containing methyl, phenyl, t-butyl, E-thienyl, trifluorome t hyl and ethoxy groups h