Browsing by Author "Chen, Shi-Yen"

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Pd(II)-Catalyzed Direct Dehydrogenative Mono- and Diolefination of Selenophenes
(2020-03-20)
Chen, Shi-Yen
;
Sahoo, Santosh K.
;
Huang, Ching-Li
;
Chan, Tung-Hsien
;
Cheng, Yen-Ju
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.
Synthesis of unsymmetrical benzotrichalcogenophenes by N-heterocyclic carbene-palladium-catalyzed intramolecular direct C3-arylation of chalcogenophenes
(2018-02-11)
Chen, Shi-Yen
;
Pao, Yu-Chieh
;
Sahoo, Santosh K.
;
Huang, Wen-Chia
;
Lai, Yu-Ying
A series of new unsymmetrical benzotrichalcogenophenes (BTCs) were synthesized by the Pd-N-heterocyclic carbene catalyzed intramolecular C3-arylation of furan, thiophene, selenophene and tellurophene units. This is the first time that a C3-direct arylation of selenophene and tellurophene moieties has ever been demonstrated.