Antimicrobial Activities of some Synthesized Pyridines, Oxazines and Thiazoles from 3-Aryl-1-(2-naphthyl)prop-2-en-1-ones
作者:Salwa Mohamed
DOI:10.3797/scipharm.0804-09
日期:——
3-Aryl-1-(2-naphthyl)-prop-2-en-1-ones were reacted with ethyl cyanoacetate to produce 4-aryl-6-(2-naphthyl)-2-oxo-1,2-dihydropyridine-3-carbonitriles, which were treated with ethyl chloroacetate to give the corresponding ester. Treatment of the latter ester with hydrazine hydrate or anthranilic acid afforded hydrazides and benzoxazines. The hydrazides were reacted with benzaldehyde or phenylisothiocyanate to afford the corresponding hydrazone and thiosemicarbazide derivatives, which were cyclized with chloroacetic acid or thioglycolic acid to the corresponding thiazole derivatives. 3-Aryl-1-(2-naphthyl)-prop-2-en-1-ones were either condensed with malononitrile under different conditions to produce carbonitrile derivatives or treated with active methylene reagents to afford the substituted cyclohexene derivatives. The structure assignment of the new compounds is based on chemical and spectroscopic evidence. Some of these compounds exhibited antimicrobial activities comparable to Ampicillin® as reference drug.
A dynamic kinetic asymmetric transfer hydrogenation–cyclization tandem reaction: an easy access to chiral 3,4-dihydro-2H-pyran-carbonitriles
作者:Dongsong Zheng、Qiankun Zhao、Xiaoying Hu、Tanyu Cheng、Guohua Liu、Wei Wang
DOI:10.1039/c7cc02156a
日期:——
(mesitylene)RuCl(monosulfonated diamine) catalysed dynamickineticresolution (DKR)–asymmetric transfer hydrogenation (ATH) process is developed for highly enantio- (up to 99% ee) and diastereo- (up to 98:2 dr) selective reduction of challenging racemic α-aryl-γ-keto malononitriles. A spontaneous cyclization reaction of the hydrogenation products delivers a cascadeprocess for efficient synthesis of useful enantioenriched
A photoactive TAPA−BPy−COF and its metalated Pd@TAPA−BPy−COF, which can both serve as the efficient reusable photocatalysts for photocatalytic applications, are reported.