Synthesis of Polysubstituted 2‐Naphthols by Palladium‐Catalyzed Intramolecular Arylation/Aromatization Cascade
作者:Jinhui Cai、Zhen‐Kai Wang、Yun‐Hao Zhang、Fei Yao、Xu‐Dong Hu、Wen‐Bo Liu
DOI:10.1002/adsc.201901573
日期:2020.3.17
A palladium‐catalyzed intramolecular α‐arylation and defluorinative aromatization strategy for the synthesis of polysubstituted 2‐naphthols is reported. With ortho‐bromobenzyl‐substituted α‐fluoroketones as the substrates and palladium acetate/triphenylphosphine as the catalyst, this method features good functional group tolerance, readily available catalyst and starting materials, and high yields
报道了钯催化的分子内α-芳基化和脱氟芳构化策略,用于合成多取代的2-萘酚。该方法以邻溴苄基取代的α-氟酮为底物,并以乙酸钯/三苯膦为催化剂,具有良好的官能团耐受性,易于获得的催化剂和起始原料以及高收率的特点。该策略的应用通过合成有用的结构单元(例如,石脑油[2,3- b ]呋喃,萘酚AS-D和配体/催化剂)得到证明。
Psoralen analogues: synthesis, inhibitory activity of growth of human tumor cell lines and computational studies
作者:A.M.A.G. Oliveira、M. Manuela M. Raposo、A.M.F. Oliveira-Campos、A.E.H. Machado、Prapawadee Puapairoj、Madalena Pedro、Maria São José Nascimento、César Portela、Carlos Afonso、Madalena Pinto
DOI:10.1016/j.ejmech.2005.10.016
日期:2006.3
Eight psoralens have been evaluated for their ability to inhibit the in vitro growth of three human tumor cell lines representing different tumor types, MCF-7 (breast cancer), NCI-H460 (non-small cell lung cancer) and SF-268 (CNS cancer). The synthesis of four new psoralens (benzofurocoumarins) is presented as well as the results of the ab initio calculations to find the parameters that relate the
Does studying about the nature(s) of science contribute to a prospective teachers' effectiveness as a science teacher? This research grew out of a course created by a science educator and historian of science who believed prospective teachers needed more complex understandings of the cultural wars surrounding science. The research team consisted of five prospective teachers who participated in the course as well as the two instructors. This paper describes the experience of participating in the course from both perspectives. We argue that studying the cultural wars over science contributes to prospective teachers' professional growth as much because the course elicits tacit beliefs about school science as it introduces more complex understandings of science. We found that prospective teachers' tacit beliefs about school science were their greatest barrier to developing more complex understandings about the nature(s) of science. We contend that willingness to grapple with complexity and developing a professional identity by locating oneself in the conversations about the nature(s) of science are better criteria for determining the professional growth of prospective teachers than knowledge measures. Finally, we argue that prospective teachers should be viewed as professionals who are responsible for finding their own voice, making their own decisions, and considering the consequences of their beliefs on their practice. This study raises questions critical to teacher education programs for prospective teachers and teacher-educators alike. (C) 2000 John Wiley & Sons, Inc.
Fries rearrangement of dibenzofuran-2-yl ethanoate under photochemical and Lewis-acid-catalysed conditions
作者:Ana M.A.G Oliveira、Ana M.F Oliveira-Campos、M.Manuela M Raposo、John Griffiths、Antonio E.H Machado
DOI:10.1016/j.tet.2004.05.060
日期:2004.7
The Fries rearrangement of dibenzofuran-2-yl ethanoate as a route to o-hydroxyacetyidibenzofurans has been investigated, both under thermal Lewis-acid catalysed and non-catalysed photochemical conditions. The reactions were examined theoretically at semi-empirical (PM3 and ZINDO/S) and density functional theory (DFT) levels. The correct selection of reaction conditions provides viable preparative routes to ortho-acylated hydroxydibenzofurans. (C) 2004 Elsevier Ltd. All rights reserved.