Palladium catalyzed coupling of organostannanes with vinyl epoxides
作者:David R. Tueting、Antonio M. Echavarren、J.K. Stille
DOI:10.1016/0040-4020(89)80010-9
日期:1989.1
The coupling reaction of organotin reagents with vinyl epoxides, catalyzed by palladium, takes place at ambient temperatures, regioselectively, giving predominately the 1,4-addition product. Both aryl- and vinylstannanes undergo coupling in high yields, while acetylenic, allylic and benzylic tin reagents either give low yields or fail to couple. Although the double bond geometry in the vinylstannane
Aromatic compounds from Artemisia campestris subsp. Glutinosa
作者:J.-T. de Pascual、I.S. Bellido、M.S. González、M.R. Muriel、J.M. Hernandez
DOI:10.1016/s0031-9422(00)82678-3
日期:1981.1
Abstract From the weakly acid fraction of the hexane extract fromArtemisiacampestris subsp. glutinosa , five new aromatics have been isolated. They hav