Preparation of a Select Tautomer of Various Unsymmetrical 1,3,5-Pentanetriones, (1Z,4Z)-1-(Aryl)-1,5-dihydroxy-5-phenylpenta-1,4-dien-3-ones, a 4H-1-benzothiopyran-4-one, and a 2-(2-oxoyl)quinolin-4(1H)-one
| Autor: | Sarah S. Carlisle, William G. Shuler, Chandra Potter, Ellyn A. Smith, Colin D. McMillan, William T. Pennington, Don VanDerveer, Thomas M. C. McFadden, Clyde R. Metz, Shabree L. Knick, Andrew J. Puciaty, Charles F. Beam, Phillip J. Chase Mabe |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 54:7207-7211 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.5b00975 |
| Popis: | Deprotonation of 1-benzoylacetone with excess lithium hexamethyldisilazide (LHMDS) or lithium diisopropylamide (LDA) resulted in a dilithium dianion-type intermediate, which underwent a Claisen-type condensation with substituted aromatic esters or an isatoic anhydride to afford unsymmetrical 1,3,5-pentanetriones or a cyclized heterocyclic product when the C-acylated intermediates contained a select ortho-substituted phenacyl pendant group. Spectral data indicated that a particular tautomer, a (1Z,4Z)-1-(4-aryl)-1,5-dihydroxy-5-phenylpenta-1,4-dien-3-one, resulted upon recrystallization of the linear products. Condensation–cyclization of the dianion-type intermediate with methyl thiosalicylate resulted in a phenacyl benzoheterocyclic thiopyranone and with 5-chloroisatoic anhydride in a phenacyl quinolinone. X-ray crystal analysis of several products afforded additional proof of structure, especially regarding which tautomer was isolated. |
| Databáze: | OpenAIRE |
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