A convenient synthetic method was reported for the preparation of N-phthaloyl dehydroamino acid esters from easily accessible vinylbromides (or vinyl tosylate) and potassium phthalimide. Rh-catalyzed asymmetric hydrogenation of these substrates with TangPhos gave the products with good to excellent enantioselectivities (up to 99% ee).
Synthesis of 2-Arylpyridopyrimidinones, 6-Aryluracils, and Tri- and Tetrasubstituted Conjugated Alkenes via Pd-Catalyzed Enolic C–O Bond Activation–Arylation
作者:Sankar K. Guchhait、Garima Priyadarshani
DOI:10.1021/acs.joc.5b00771
日期:2015.6.19
the synthesis of biologically important 2-aryl-4H-pyrido[1,2-a]pyrimidin-4-ones and 6-aryluracils via previously unknown Pd-catalyzed enolic C–OH activation–arylation of pyridopyrimidin-2,4-diones and barbituric acids, respectively, with boronic acids is reported. The starting materials are readily available, and products are obtained in high yields. An efficient and chemo- and stereoselective access
A general method of synthesis of functionalized Z-vinylic tellurides starting from β-dicarbonyl compounds
作者:Rafael E Barrientos-Astigarraga、Priscila Castelani、Celso Y Sumida、Julio Zukerman-Schpector、João V Comasseto
DOI:10.1016/s0040-4020(01)01204-2
日期:2002.2
Z-Vinylic tellurides are prepared by stereoselective vinylic substitution on Z/E mixtures of enolphosphates, acetates, tosylates and triflates by organotellurolates. The reaction is sensitive to the nature of the organotellurolate; the aromatic derivatives react slower than the aliphatic ones. The reaction time is not influenced by the nature of the leaving group.
Synthesis of Bicyclic Pyridones via Cyclocondensation of Heterocyclic Ketene Aminals with β-Ketoester Enol Tosylates
作者:Jun Lin、Sheng-Jiao Yan、Yan-Fei Niu、Rong Huang
DOI:10.1055/s-0029-1217984
日期:2009.10
A series of novel bicyclic pyridones were easily prepared by cycliccondensation of heterocyclic ketene aminals with β-keto ester enol tosylates in the presence of a base to give products in excellent yields (80-95%).