Some Reactions with 6,8-Di-tert-butyl-4-phenyl-3,4-dihydrocoumarin Einige Reaktionen des 6,8-Di-tert-butyl-4-phenyl-3,4-dihydrocoumarins
作者:A. Z. Haikal、A. F. El-Farargy、M. El-Mobuayed、M. M. Hamad
DOI:10.1002/ardp.19903230311
日期:——
Studies on coumarin derivatives. 6,8-Di-tert-butyl-4-phenyl-3,4-dihydrocoumarin (I) was obtained by Pechmann condensations of 2,4-di-tert-butyl-phenol with cinnamic acid in presence of 70% H 2 SO 4 . A series of derivatives of I was prepared
Ultrasonics promoted synthesis of thiazolidinones from 2-aminopyridine and 2-picolilamine
作者:Daniela P. Gouvêa、Valéria D.O. Bareño、Juliano Bosenbecker、Bruna B. Drawanz、Patrícia D. Neuenfeldt、Geonir M. Siqueira、Wilson Cunico
DOI:10.1016/j.ultsonch.2012.03.004
日期:2012.11
The efficient multicomponent synthesis of thiazolidinones from the reaction of arenealdehydes, mercaptoacetic acid and 2-picolilamine or 2-aminopyridine under ultrasound irradiation are reported. The reaction with 2-aminopyridine needs a Lewis acid catalysis to afford the corresponding 2-aryl-3-(pyridin-2-yl)-1,3-thiazolidin-4-ones. All novel compounds were identified and characterized by H-1 and C-13 NMR spectra. Applying the sonochemical methodology, two series of heterocyclic thiazolidinones were synthesized in good yields after short reaction times. (C) 2012 Elsevier B.V. All rights reserved.
Co(OAc)<sub>2</sub>-Catalyzed Trifluoromethylation and C(3)-Selective Arylation of 2-(Propargylamino)pyridines via a 6-<i>Endo-Dig</i> Cyclization
作者:Jianjun Li、Yifan Lei、Yang Yu、Cong Qin、Yiwei Fu、Hao Li、Wei Wang
DOI:10.1021/acs.orglett.7b02759
日期:2017.11.17
arylation of 2-(propargylamino)pyridines has been developed. A new 6-endo-dig cyclization involving an unprecedented C(3) selective arylation of the pyridines instead of a commonly observed 5-exo-dig cyclization with “N” is realized. Moreover, the study presents the first case of the installation of a trifluoromethyl group into electron-deficient azaarenes. The process delivers an efficient cascade approach