A palladium-catalyzed (Pd(PPh3)4/Ag2O/PivOH) C2-regioselective direct dehydrogenative alkynylation of unsubstituted selenophene was achieved. The selenophenes substituted with R1 groups at 2-position can be C5-alkynylated with a variety of 4-substituted phenylacetylenes (R2 groups). The R1 and R2 can be either electron-withdrawing or electron-donating groups, demonstrating a wide range of substrate
[EN] FUSED HETEROCYCLIC DERIVATIVE AND USE THEREOF IN MEDICINE<br/>[FR] DÉRIVÉ HÉTÉROCYCLIQUE FUSIONNÉ ET SON UTILISATION EN MÉDECINE<br/>[ZH] 一种并环杂环衍生物及其在医药上的应用
申请人:[en]HAISCO PHARMACEUTICAL GROUP CO., LTD.;[zh]海思科医药集团股份有限公司
Beelitz, Klaus; Praefcke, Klaus; Gronowitz, Salo, Liebigs Annalen der Chemie, 1980, # 10, p. 1597 - 1603
作者:Beelitz, Klaus、Praefcke, Klaus、Gronowitz, Salo
DOI:——
日期:——
Pd(II)-Catalyzed Direct Dehydrogenative Mono- and Diolefination of Selenophenes
作者:Shi-Yen Chen、Santosh K. Sahoo、Ching-Li Huang、Tung-Hsien Chan、Yen-Ju Cheng
DOI:10.1021/acs.orglett.0c00506
日期:2020.3.20
Pd(II)-catalyzed dehydrogenative Heck olefination of selenophenes with a broad olefinic substrate scope and high functional group tolerance is demonstrated. Carbonyl-substituted and phenyl-substituted olefins with electron-donating (D) and electron-accepting (A) groups can be regioselectively installed at C2 of the selenophene. The 2-olefinated selenophenes can subsequently undergo a second oxidative olefination to rapidly produce a new class of symmetrical D-pi-D or unsymmetrical D-pi-A 2,5-diolefinated selenophene materials.