作者:A. V. Vasilyev、S. Walspurger、M. Haouas、J. Sommer、P. Pale、A. P. Rudenko
DOI:10.1039/b412323a
日期:——
In superacids with H0
=
−14 to −20, it has been found that 1,3-diarylpropynones ArCCCOAr′ are either protonated on oxygen of carbonyl groups with the formation of stable ions ArCCC(O+H)Ar′ or undergo further transformations when the highly conjugated system is electron-rich enough. In the latter case, 3-arylindenones are produced very rapidly and with high efficiency (up to 95% yield in less than 30 min). The influence of the substituents Ar, Ar′ and of the reaction conditions on the behavior of 1,3-diarylpropynones and on the intramolecular cyclisation have been studied. From the collected data, a mechanism has been proposed involving vinyl cations ArC+=CHCOAr′ and/or dications ArC+=CHC(O+H)Ar′.
An efficient synthesis of chiral 3-arylindanones via iridium-catalyzed asymmetrichydrogenation of 3-arylindenones has been developed. The reaction showed good compatibility with various functional groups, delivering a variety of 3-arylindanones in excellent yields and with good enantioselectivities. The reaction was also carried out on a gram-scale, delivering the product in quantitative yield. In
The one-pot synthesis of 1H-inden-1-one from 1-(2-bromoaryl)prop-2-en-1-ol was described. The reaction involved a sequential intramolecular Heck reaction followed by an aerial oxidation of allylic alcohol.
A new, fast and efficient synthesis of 3-aryl indenones: intramolecular cyclization of 1,3-diarylpropynones in superacids
作者:Aleksander V Vasilyev、Stéphane Walspurger、Patrick Pale、Jean Sommer
DOI:10.1016/j.tetlet.2004.03.026
日期:2004.4
1,3-Diarylpropynones were cleanly converted to the corresponding 3-arylindenones in various superacidic media. This new. simple. one-pot reaction proved to be efficient (yields up to 95%) and very fast (reaction time less than 30 min). (C) 2004 Elsevier Ltd. All rights reserved.
Chemistry of 3-arylindenones: behavior in superacids and photodimerization
作者:S. Walspurger、A.V. Vasilyev、J. Sommer、P. Pale
DOI:10.1016/j.tet.2005.01.110
日期:2005.4
In superacids HSO3F and CF3SO3H, it has been found that 3-arylindenones are very stable and exist as a doubly protonated species. NMR showed protonation both at the oxygen of the carbonyl group and at the C2 carbon of the indenone system. 3-Arylindenones proved however very sensitive to heat and light. Their [2 + 2] photodimerization under daylight has been studied. (c) 2005 Elsevier Ltd. All rights reserved.