Synthesis, in vitro antibacterial activities of a series of 3- N -substituted canthin-6-ones
摘要:
An improved synthetic route of canthin-6-one was accomplished. To further enhance the antibacterial potency and improve water solubility, a series of 3-N-alkylated and 3-N-benzylated canthin-6-ones were designed and synthesized, and their in vitro antibacterial activities were evaluated. A clear structure-activity relationship with peak minimal inhibitory concentration (MIC) values of 0.98 (mu g.mL(-1)) was investigated. Particularly, compounds 6i-r and 6t were found to be the most potent compounds with minimal inhibitory concentration (MIC) values lower than 1.95 (mu g.mL(-1)) against Staphylococcus aureus. (C) 2015 Elsevier Ltd. All rights reserved.
作者:Kevin M. Czerwinski、Craig A. Zificsak、John Stevens、Melissa Oberbeck、Christopher Randlett、Melissa King、Steve Mennen
DOI:10.1081/scc-120017199
日期:2003.1.5
An improved route has been devised which provides canthin-6-one in the highest yield from tryptamine to date. Tryptamine is converted to N-b-benzyltryptamine via reaction with benzoylchloride and reduction using LAH. Pictet-Spengler condensation with 2-ketoglutaric acid, removal of the protecting group by CTH, and aromatization with MnO2 affords canthin-6-one in 48% overall yield.
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