methodology has been developed for the synthesis of a variety of novel trifluoroacetylated enaminones by using trifluoroacetic anhydride in DCE as solvent and DBU as a base via electrophilic trifluoroacetylation. X-ray crystallographic studies confirmed the trifluoroacetylation and E stereoisomeric form of the novel compounds. The synthetic strategy has the advantage of using an inexpensive and non-toxic base
已经开发了一种有效的方法,通过使用三氟乙酸酐在 DCE 中作为溶剂和 DBU 作为碱,通过亲电三氟乙酰化合成各种新型三氟乙酰化烯胺酮。X 射线晶体学研究证实了新化合物的三氟乙酰化和 E 立体异构形式。合成策略的优点是使用廉价且无毒的碱来产生优异的产量。带有各种官能团的合成物可以进一步扩展以形成杂环化合物。
Singh, Okram Mukherjee; Junjappa, Hiriyakkanavar; Ila, Hiriyakkanavar, Journal of the Chemical Society. Perkin transactions I, 1997, # 23, p. 3561 - 3565
作者:Riccardo Surmont、Guido Verniest、Mathias De Schrijver、Jan Willem Thuring、Peter ten Holte、Frederik Deroose、Norbert De Kimpe
DOI:10.1021/jo2000989
日期:2011.5.20
Fluorinated pyrazoles bearing additional functional groups that allow further functionalization are of considerable interest as building blocks in medicinal chemistry. The developed synthetic strategy for new 3-amino-4-fluoropyrazoles consists of a monofluorination of beta-methylthio-beta-enaminoketones using 1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor) toward the corresponding monofluorinated enaminoketones, followed by condensation with different hydrazines.