作者:Harald Bock、Stephanie Huet、Pierre Dechambenoit、Elizabeth A. Hillard、Fabien Durola
DOI:10.1002/ejoc.201403341
日期:2015.2
functionalization of chrysene by Friedel–Crafts acylation with ethyl chloroglyoxylate or by bromination followed by substituent exchange enables the formation of bis[5]helicene-tetracarboxylates and tetracarboxdiimides through Perkin reactions and palladium-catalyzed cyclizations. Tetrasubstituted bishelicenic dichrysenoanthracenes and dinaphthochrysenes are thus obtained fromchrysene in four to six steps
作者:Harald Bock、Daniel Subervie、Pierre Mathey、Anirban Pradhan、Parantap Sarkar、Pierre Dechambenoit、Elizabeth A. Hillard、Fabien Durola
DOI:10.1021/ol500154k
日期:2014.3.21
alkylamine, yield diarylmaleimides in a one-pot procedure. The arylglyoxylic acids are obtained by arene acylation with ClCOCO2Et and reduced with NaI and hypophosphorous acid to the arylacetic acids. With 2,7-di-tert-butyl-pyren-4-yl or chrysen-6-yl as the aryl, photocyclodehydrogenation of the diarylmaleimides yields substituted helicenes which can be reduced to stable anions. The helicenes combine bathochromically