Reaction of α- and β-ionones 1 and 2 with dialkylformamide/phosphorus oxychloride affords enamines 6 and 7 along with the expected chloro derivatives 4 and 5. Reaction of 6a with hydrazines, hydroxylamine and guanidine furnished pyrazoles, isoxazole, pyrimidine 8–10 showing the potential of these enaminones as key intermediates in the synthesis of synthetic retinoids.
Synthesis and antimicrobial activity of heterocyclic ionone-like derivatives
作者:M Anzaldi
DOI:10.1016/s0223-5234(99)00209-3
日期:1999.10
A number of heterocyclic ionone-like derivatives 5 were prepared with appropriate bifunctional reagents by one-pot cyclisation of 3-dimethylamino-5-(2,6,6-trimethyl-2-cyclohexen-1-yl)-2,4-pentadienal 3a, which was, in turn, obtained from alpha-ionone with N,N-dimethylformamide/phosphorus oxychloride. All compounds 5 possess remarkable activity against the selected Gram-positive, Gramnegative bacterial strains and against Candida albicans. Derivatives 5a2 and 5a6, acting at a high level especially against both Propionibacterium acnes and Staphylococcus aureus, could play a potential role in the treatment of acne and related skin disorders. (C) 1999 Editions scientifiques et medicales Elsevier SAS.
Synthesis and biological evaluation of novel heterocyclic ionone-like derivatives as anti-inflammatory agents
Five- and six-membered heterocyclic ionone-like derivatives 4-6 have been synthesised in one step and with good yield from the key intermediate 3a and appropriate bifunctional reagents. Four were active as inhibitors of the respiratory burst of human neutrophils without affecting cell viability. The two most active compounds (5a,d) tested in neutrophil migration assays, were also found to be potent inhibitors of neutrophil chemotactic responsiveness. These two molecules could be considered as lead compounds of new drugs which can be an effective tool to treat psoriasis and related neutrophilic dermatoses. (c) 2006 Elsevier Ltd. All rights reserved.