New Route to Styrylchromones via [1-(2-Hydroxybenzoyl)alkylidene]triphenylphosphoranes
作者:F. Zammattio、J. D. Brion、P. Ducrey、G. Le Baut
DOI:10.1055/s-1992-26115
日期:——
Several [1-(2-hydroxybenzoyl)alkylidene]triphenylphosphoranes have been obtained in good yields through acylation of the corresponding alkylidenetriphenylphosphoranes, prepared in situ, by the easily available methyl 2-hydroxybenzoates. These ylides proved to be good starting materials for the synthesis of the corresponding 2-styrylchromones (2-styryl-4H-1-benzopyran-4-ones).
Syntheses of highly functionalised 6-substituted pteridines
作者:Donie Guiney、Colin L. Gibson、Colin J. Suckling
DOI:10.1039/b211564f
日期:2003.2.11
Methods for the synthesis of polyfunctional 6-substituted pteridines from the corresponding 6-aldehydes are described. Alkene, ester, ketone, amide, cyano, oxime, bromo, methoxy and dihydroxy functional groups have all been introduced principally through improved methodologies for Wittig reactions using 2-thioalkyl-6-formylpteridines as substrates. Further modification of the alkenes derived from the
Beschrieben werden neue substituierte Acrylophenone der Formel (I)
in denen
R1, R2, R3, R4, A, X und Z die in der Beschreibung angegebene Bedeutung haben, sowie mehrere Verfahren zu deren Herstellung. Verwendet werden die neuen Acrylophenone der Formel (I) als Herbizide.
式(I)的新取代丙烯酰苯胺
其中
R1、R2、R3、R4、A、X 和 Z 的含义,以及几种制备方法。式(I)的新丙烯酰苯胺可用作除草剂。
Organocatalyzed Hydroacylation of Enones by Photosensitization of Acyl Silanes
A mild protocol for hydroacylation of enones through photosensitization of acyl silanes with thioxanthone under blue light (455 nm) irradiation is reported. A Brønsted acid is used as a cocatalyst in the reaction. The versatility of the method is demonstrated through inter- and intramolecular hydroacylation reaction. The hydroacylation product is applied for synthesizing an anti-HCV agent. Mechanistic