Facile Microwave-Promoted Knoevenagel Condensation and the Combination of Knoevenagel/ Michael addition Reaction in Aqueous Medium Containing Ionic Surfactant
作者:Mithu Saha、Jahar Dey、Kochi Ismail、Amarta K. Pal
DOI:10.2174/157017811797249272
日期:2011.10.1
A simple, efficient, environment-friendly and high yielding procedure is developed for the Knoevenagel condensation and the combination of Knoevenagel/ Michael addition reaction of various 1, 3-dicarbonyls and aryl aldehydes in an aqueous surfactant medium. The reaction can be dramatically improved under microwave-irradiation.
Rearrangement of Methylenebis(cyclohexane-1,3-dione) Enols Induced by Mn(III)-Catalyzed Aerobic Oxidation
作者:Yûki Murakami、Kazuki Hisano、Hiroshi Nishino
DOI:10.1021/acs.joc.2c00647
日期:2022.7.1
The Mn(III)-catalyzed aerobic oxidation of methylenebis(cyclohexane-1,3-dione) enols 1 resulted in 6a-hydroxy-2,3,4,6a,7,8,9,10a-octahydro-1H-benzo[c]chromene-1,6,10-triones 3 during the formation of 4,5,8,10,11,12-hexahydro-2H-benzo[b]oxecine-2,6,7,9(3H)-tetraones 2. The mechanism for the formation of 3 was proposed on the basis of the isolation of intermediates 2, which were transformed into 3 under
Mn(III) 催化亚甲基双(环己烷-1,3-二酮)烯醇1的有氧氧化产生 6a-羟基-2,3,4,6a,7,8,9,10a-octahydro-1 H-苯并[ c ]chromene-1,6,10-triones 3形成 4,5,8,10,11,12-hexahydro-2 H -benzo [ b ]oxecine-2,6,7,9(3 H )-四酮2 . 在分离中间体2的基础上提出了形成3的机理,中间体在 Claisen 和逆 Claisen 条件下转化为3 。
Nagarajan, K; Shenoy, S J, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1992, vol. 31, # 2, p. 73 - 87
作者:Nagarajan, K、Shenoy, S J
DOI:——
日期:——
NMR spectral studies of dimedone-aldehyde adducts Part 2. 1H and 13C NMR studies of the adducts
作者:Richard J. Cremlyn、Alan G. Osborne、Joanne F. Warmsley
DOI:10.1016/0584-8539(96)01696-0
日期:1996.10
A detailed study of the 270 MHz H-1 and 67 MHz C-13 NMR spectra of four series of dimedone adducts and ''anhydrides'' is presented. A valuable (5)J(HH) homoallylic coupling has been identified which has facilitated signal locations utilising 2D HETCOR and COLOC experiments. Some earlier spectral assignments are revised.
Nagarajar K., Shenoy S. J., Indian J. Chem. A, 31 (1992) N 2, S 73-87