Oxidative Friedel−Crafts Reaction and its Application to the Total Syntheses of <i>Amaryllidaceae</i> Alkaloids
作者:Kimiaka C. Guérard、Cyrille Sabot、Léanne Racicot、Sylvain Canesi
DOI:10.1021/jo802728u
日期:2009.3.6
numerous natural products. As an illustration of the potential of this transformation, total syntheses of compounds belonging to the Amaryllidaceae alkaloids family such as O-methyljoubertiamine, mesembrine, and its natural derivative the dihydro-O-methylsceletenone have been achieved in eight/nine steps. The synthetic route to these molecules features a novel and efficient transformation on the basis
Copper-catalyzed <i>O</i>-arylation of phenols with diazonium salts
作者:Xin Fang、Chengning Qi、Xiangqian Cao、Zhi-Gang Ren、David James Young、Hong-Xi Li
DOI:10.1039/d3gc02541a
日期:——
It is well known that diazonium salts (ArN2+) react with phenols (Ar′OH) to give aryl diazoethers or diazo compounds, but their cross-coupling to exclusively access diaryl ethers is challenging. Herein we disclose the Cu-catalyzed etherification of phenols with aryl diazonium salts at room temperature, yielding diaryl ethers in moderate to excellent yields. The advantages of this protocol are mild
BELL H. C.; PINHEY J. T.; STERNHELL S., AUSTRAL. J. CHEM., 1979, 32, NO 7, 1551-1560
作者:BELL H. C.、 PINHEY J. T.、 STERNHELL S.
DOI:——
日期:——
‘Aromatic ring umpolung’, a rapid access to the main core of several natural products
作者:Kimiaka C. Guérard、Cyrille Sabot、Marc-André Beaulieu、Marc-André Giroux、Sylvain Canesi
DOI:10.1016/j.tet.2010.03.096
日期:2010.7
substituted phenols in the presence of (diacetoxyiodo)benzene promotes the formation of a phenoxenium ion, a very electrophilic species able to react with various nucleophiles leading rapidly to a plethora of different cores present in natural products via several novel oxidative processes. This strategy fits within the concept of ‘aromatic ring umpolung’; in this paper a personal account by our laboratory