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• W1977795812 endingPage "4481" @default.
• W1977795812 startingPage "4467" @default.
• W1977795812 abstract "The synthesis of 20 alkyl amides, including 15 naturally occurring polyunsaturated alkyl amides previously identified from Echinacea spp. (1–13 and 62) or from Achilla sp. (55) and five previously unknown geometric isomers (23, 28, 67, 73, and 80), is described. Importantly, these amides include all of the major alkyl amides present in commercially used Echinacea extracts. The syntheses demonstrate methodology used for constructing alkyl amides containing conjugated diyne and isomerically pure enyne and diene moieties and may be adapted easily for the preparation of other alkyl amides present in Echinacea spp. Terminal-conjugated diynes were prepared by a Cadiot–Chodkiewitz coupling/deprotection sequence utilizing a protected bromoacetylene, and methyl-substituted diynes were made via a base-catalyzed rearrangement of terminal-skipped diynes. Conjugated dienes were prepared conveniently and with high stereoselectivity by the reduction of enynes or diynes with Rieke zinc. With the exception of 1–2 and 11–12, the alkyl amides are synthesized here for the first time, and their NMR data are consistent with that of the reported isolated natural compounds." @default.
• W1977795812 created "2016-06-24" @default.
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• W1977795812 date "2011-05-06" @default.
• W1977795812 modified "2023-09-27" @default.
• W1977795812 title "Polyunsaturated Alkyl Amides from Echinacea: Synthesis of Diynes, Enynes, and Dienes" @default.
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• W1977795812 doi "https://doi.org/10.1021/jo200289f" @default.
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• W1977795812 hasPublicationYear "2011" @default.
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