Base-mediated benzannulation of α-cyanocrotonates with ynones: facile synthesis of benzonitriles and fluorenes
作者:Maneesh Kumar Reddy Singam、Attunuri Nagireddy、Sridhar Reddy Maddi
DOI:10.1039/d0gc00608d
日期:——
Benzonitriles and cyanofluorenes have been rapidly obtained via the [3 + 3] benzannulation of readily available alkynones and α-cyanocrotonates using KOtBu as the only reagent and EtOH (and CO2) is the only by-product.
Decarboxylation reaction. VIII. Reaction of electron-deficient carbon-carbon double bonds with trichloroacetic acid. A unique 1,1-dichlorocyclo-propane formation through .BETA.-trichloromethylation.
作者:KATSUMI NANJO、KUNIO SUZUKI、MINORU SEKIYA
DOI:10.1248/cpb.26.848
日期:——
The present paper describes the 1, 1-dichlorocyclopropane formation from highly electron-deficient carbon-carbon double bonds conjugated, in the main, with two cyano groups by allowing to react with trichloroacetic acid. β-Trichloromethylation was indicated in some cases. Path of the 1, 1-dichlorocyclopropane formation is presumed not to involve dichlorocarbene, but β-trichloromethylated intermediate.
Synthesis and antimicrobial activity of novel 2-(pyridin-2-yl)thieno[2,3-d]pyrimidin-4 (3H)-ones
作者:NITIN G. HASWANI、SANJAYKUMAR B. BARI
DOI:10.3906/kim-1012-888
日期:——
In the present study, some new 2-(pyridin-2-yl)thieno[2,3-d] pyrimidin-4(3H)-ones derivatives (IIa-o) were synthesized. The target compounds (IIa-o) were synthesized through the acid catalyzed condensation of 2-cyano, 3-cyano, and 4-cyano-pyridines with various 2-amino-3-carbethoxythiophenes (Ia-e). All thiophene derivatives were synthesized by Gewald reaction. The structures of the newly synthesized compounds were confirmed by UV-Visible, FT-IR, ^1H-NMR, and mass spectral studies. All synthesized compounds were evaluated for their antimicrobial activity against various gram-positive and gram-negative bacterial and fungal strains. Amongst the synthesized compounds IIa, IIb, IId, IIe, and IIm were found to be active.