A study on the reaction of 3-alkyl(aryl)imidazo[1,5-<i>a</i>]pyridines with ninhydrin
作者:Mervat S. Sammor、Mustafa M. El-Abadelah、Ahmad Q. Hussein、Firas F. Awwadi、Salim S. Sabri、Wolfgang Voelter
DOI:10.1515/znb-2018-0039
日期:2018.6.27
Abstract The reaction of 3-alkyl(aryl)imidazo[1,5-a]pyridines (1) with ninhydrin in dichloromethane at room temperature delivered good yields of the respective 2-hydroxy-2-(imidazo[1,5-a]pyridine-1-yl)indene-1,3-diones. In the presence of dimethyl acetylenedicarboxylate (DMAD), this uncatalyzed electrophilic substitution reaction, involving C-1 (in 1) and the central C=O (in ninhydrin), takes precedence
A copper(I)-catalyzed direct transannulation of N-heteroaryl aldehydes or ketones with alkylamines via C-sp(3)-H amination has been achieved using molecular oxygen as a sole oxidant. N-Heteroarenes are employed as the amine source. This transformation provides a rapid and concise access to multifunctional imidazo[1,5-a]pyridines.
Novel One-Pot Synthesis of Dihydroacenaphtho[1,2-f][1,3]oxazepines via 1,4-Dipolar Cycloaddition Reaction
作者:Mustafa M. El-Abadelah、Mervat S. Sammor、Ahmad Q. Hussein、Firas F. Awwadi
DOI:10.3987/com-17-13862
日期:——
A facile three-component reaction involving 3-alkyl(aryl)imidazo[1,5-a]pyridines 7a-g, dimethyl acetylenedicarboxylate 2 (DMAD) and acenaphthene-1,2-dione 5 led to the construction of the respective dihydroacenaphtho[1,2-f][1,3]oxazepine-10,11-dicarboxylates 10a-g in fair yields. Structures of the latter tetracyclic adducts, are based on NMR and MS spectral data and confirmed by single-crystal X-ray diffraction analysis for compound 10a. Most logically, the reaction proceeds via initial formation of the relevant diastereomeric spiro[1,3]oxazine-1,4-dipolar cycloadducts 12, 13 which then suffer skeletal rearrangement leading to the respective acenaphtho[1,2-f][1,3]oxazepines 10a-g.