One-Pot Synthesis of Asymmetric Annulated Bis(pyrrole)s
作者:Deborah A. Smithen、T. Stanley Cameron、Alison Thompson
DOI:10.1021/ol202457n
日期:2011.11.4
Condensation of activated functionalized pyrroles with acetone results in asymmetricbis(pyrrole)s, formed via ring annulation. The methodology is somewhat general and can be applied to a variety of ketones, as well as to a range of pyrrolic substrates that do not bear electron-withdrawing groups directly adjacent to the pyrrole ring.
Next to the "normal" calix[4]pyrrole 1, the N-confused calix[4]pyrrole 2 is formed in substantial amounts (up to 22 % yield) as side product in the acid-catalyzed condensation reaction of ketones and pyrrole. In some cases, doubly N-confused calix[4]pyrroles are also formed.
Synthesis, Structure, Anion Binding, and Sensing by Calix[4]pyrrole Isomers
作者:Ryuhei Nishiyabu、Manuel A. Palacios、Wim Dehaen、Pavel Anzenbacher
DOI:10.1021/ja0622150
日期:2006.9.1
The synthesis, structure, and anionbindingproperties of chromogenic octamethylcalix[4]pyrroles (OMCPs) and their N-confused octamethylcalix[4]pyrrole isomers (NC-OMCPs) containing an inverted pyrrole ring connected via alpha'- and beta-positions are described. X-ray diffraction analyses proved the structures of two synthesized isomeric pairs of OMCPs and NC-OMCPs. The addition of anions to solutions
Syntheses of Calix[4]Pyrroles by Amberlyst-15 Catalyzed Cyclocondensations of Pyrrole with Selected Ketones
作者:Shive Chauhan、Bhaskar Garg、Tanuja Bisht
DOI:10.3390/12112458
日期:——
A facile and efficient protocol is reported for the synthesis of calix[4]pyrrolesand N-confused calix[4]pyrroles in moderate to excellent yields by reaction of dialkyl orcycloalkyl ketones with pyrrole catalyzed by reusable AmberlystTM-15 under eco-friendlyconditions.
Anion recognition by α-arylazo-N-confused calix[4]pyrroles
作者:Rong Gu、Stefaan Depraetere、Jan Kotek、Jan Budka、Ewa Wagner-Wysiecka、Jan F. Biernat、Wim Dehaen
DOI:10.1039/b507508d
日期:——
The first example of substitution reaction in the free α-position of N-confused calix[4]pyrroles is reported: azo-coupling with various arenediazonium salts. The obtained azocompounds were used for studies of their anion-binding properties by UV-Vis spectroscopy.