Gold-Catalyzed Oxidative Cyclizations of<i>cis</i>-3-En-1-ynes To Form Cyclopentenone Derivatives
作者:Sabyasachi Bhunia、Satish Ghorpade、Deepak B. Huple、Rai-Shung Liu
DOI:10.1002/anie.201108027
日期:2012.3.19
Golden tendencies: The title reaction for synthesizing cyclopentenonederivatives utilizes a gold complex and 8‐methylquinoline oxide as the catalyst system (see scheme; IPr=1,3‐bis(diisopropylphenyl)imidazol‐2‐ylidene). Such products are not attainable using diazocarbonyl reagents, as the gold carbenoids tend to react with CH bonds.
Iron(III) Chloride and Diorganyl Diselenide-Promoted Nucleophilic Closures of 1-Benzyl-2-alkynylbenzenes in the Preparation of 9-(Organoselanyl)-5<i>H</i>-benzo[7]annulenes
作者:Thais Prochnow、Davi F. Back、Gilson Zeni
DOI:10.1002/adsc.201501055
日期:2016.3.31
Iron‐promoted cyclization of 1‐benzyl‐2‐alkynylbenzenes with diorganyl diselenides led to the synthesis of 9‐(organoselanyl)‐5H‐benzo[7]annulenes whereby the mutual action between diorganyl diselenides and iron(III) chloride in a 0.5:1.0 mol ratio was essential in order to achieve the maximal yields of the products. The cyclization reaction tolerated a variety of functional groups, such as trifluoromethyl
Flexible and Practical Synthesis of Anthracenes through Gold-Catalyzed Cyclization of<i>o</i>-Alkynyldiarylmethanes
作者:Chao Shu、Cheng-Bin Chen、Wei-Xi Chen、Long-Wu Ye
DOI:10.1021/ol402713g
日期:2013.11
A concise gold-catalyzed method for the preparation of anthracenes from o-alkynyldiarylmethanes has been developed. Under mild reaction conditions, versatile anthracene derivatives were formed in moderate to good yields. The high flexibility, broad substrate scope, and mild nature of this reaction render it a viable alternative for the synthesis of anthracenes.