Synthesis of isothiosemicarbazones of potential antitumoral activity through a multicomponent reaction involving allylic bromides, carbonyl compounds and thiosemicarbazide
作者:Laiéli S. Munaretto、Misael Ferreira、Daniela P. Gouvêa、Adailton J. Bortoluzzi、Laura S. Assunção、Juliana Inaba、Tânia B. Creczynski-Pasa、Marcus M. Sá
DOI:10.1016/j.tet.2020.131231
日期:2020.6
of isothiosemicarbazones and 2-hydrazono-1,3-thiazin-4-ones through a multicomponent reaction featuring allylic bromides, carbonylcompounds and thiosemicarbazides is described. The transformations proceed under mild and environmentally benign conditions with high yields and stereoselectivity. All novel compounds were obtained in high purity without the need for chromatography stages. Different functional
Diastereoselective synthesis of α-(aminomethyl)-γ-butyrolactones via a catalyst-free aminolactonization
作者:P. Veeraraghavan Ramachandran、Daniel R. Nicponski
DOI:10.1039/c4cc05765a
日期:——
An auto-catalytic domino reaction involving an aza-Michael reaction, proton transfer, and lactonization furnishing α-aminomethyl-γ-butyrolactones in near quantitative yields and excellent diastereoselectivity is described.
4-(Dimethylamino)pyridine as a catalyst for the lactonization of 4-hydroxy-2-methylenebutanoate esters
作者:Daniel R. Nicponski
DOI:10.1016/j.tetlet.2014.02.024
日期:2014.3
The catalytic action of 4-(dimethylamino)pyridine (DMAP) in lactonizing 4-hydroxy-2-methylenebutanoate esters to 2-methylene-γ-butyrolactones is described. The use of DMAP, which functions as an excellent complement to the more traditional acid-catalyzed lactonization protocol, allows for the synthesis of 2-methylene-γ-butyrolactones containing acid-sensitive groups under essentially neutral conditions
A highly efficient, multicomponent protocol for the construction of functionalized quinolinopyranpyrazole scaffolds with high stereoselectivity has been developed through the application of a domino reaction. All the quinolinopyranpyrazoles were synthesized under solvent- and catalyst-free conditions and required no work-up or column chromatography.
Synthesizing molecular knots that mimic the catalytic functionality of stereospecific or stereoselective enzymes are an intriguing task in chemistry. Synthetic anion receptors even with moderate halide binding affinities may catalyze chemical reactions involving carbon–halogen bond cleavage. Herein we report isostructural self-assembled trefoil molecular knots (Cu-TK, Cd-TK, Zn-TK) based on Cu(II)