Copper-Catalyzed Cascade Preparation of Dihydropyrimidin-4-ones from <i>N</i>-(Prop-2-yn-1-yl)amides and Azides
作者:Jinjin Wang、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/jo401094j
日期:2013.9.6
Dihydropyrimidin-4-ones were efficiently synthesized from copper catalyzed reaction between N-(prop-2-yn-1-yl)amides and sulfonylazides under mild conditions in moderate to excellent yields (up to 96% yields). The cascade process involves the copper-catalyzed alkyne–azide cycloaddition, the formation of ketenimine intermediate, the intramolecular nucleophilic addition of ketenimine, and subsequent
A palladium-catalyzed process to construct oxazoles and oxazolines with broad functional-group tolerance has been developed, and the method introduces difluoromethyl groups into heterocycles in a one-pot fashion. This system uses a carbonyl oxygen as the acceptor for the addition of a vinylpalladium intermediate to achieve the cyclization. Oxazoline derivatives are generated as the Z-isomer with high
Synthesis of 2,2,2‐Trifluoroethyl Oxazoles, Oxazolines and Furans via Alkyne Oxytrifluoromethylation
作者:Jia‐Jia Dong、Song‐Lin Zhang
DOI:10.1002/adsc.201901405
日期:2020.2.21
This study reports an oxytrifluoromethylation method for construction of oxazoles and furans motif and the concurrent incorporation of a 2,2,2‐trifluoroethyl group at the aromatic C5‐position. High‐valent copper(III) trifluoromethyl compounds are crucial to this reaction that induces oxy‐trifluoromethylation of alkynes with a pendant amide/enol group functioning as the oxygen‐nucleophile. A wide substrate
Synthesis and Bioactivities of Novel<i>N</i>-(4-(2-Aryloxythiazol-5-yl)but-3-yn-2-yl)benzamides
作者:Youquan Zhu、Pei Liu、Danyang Wang、Jin Zhang、Jie Cheng、Yuan Ma、Xiaomao Zou、Huazheng Yang
DOI:10.1002/cjoc.201200824
日期:2013.2
AbstractA series of novel N‐(4‐(2‐aryloxythiazol‐5‐yl)but‐3‐yn‐2‐yl)benzamide derivatives were designed and synthesized. Their structures were identified by 1H NMR and elemental analyses. Preliminary bioassays indicated that some title compounds provided >80% control of Sclerotinia sclerotiorum at 50 µg/mL and >70% herbicidal activities against B. campestris at 100 µg/mL. Their structure‐activities relationships were also discussed.