二茂铁基噻吩2,3-Fc 2 - c C 4 H 2 S(9),2,4-Fc 2 - c C 4 H 2 S(10)和2,3,4-Fc 3 - c C 4 HS (11)已经制备由2-或3-倍适当溴噻吩的Negishi交叉偶联反应5 - 7与FcZnCl(8 ; FC =铁(η 5 -C 5 H ^ 4)(η 5 -C 5高5))在[Pd(PPh 3)4 ]或[Pd(CH 2 CMe 2 P t Bu 2)(μ-Cl)] 2作为催化剂的情况下。关于二茂铁基取代的芳族杂环的电子转移研究,电化学以及原位紫外-可见-近红外光谱电化学都突出了这些化合物在一系列单,二,三和四茂铁噻吩中的电化学性质,包括2-FC- ç ç 4 ħ 3 S(1),3-FC- ç ç 4 ħ 3 S(2),2,5--Fc的2 -c C 4 H 2 S( 3),3,4-Fc 2 - c C 4 H 2 S( 4),2,3,5-Fc
Conversion of tributylstannylferrocene to a variety of heteroaryl ferrocenes
摘要:
Tributylstannylferrocene (Fc-SnBu3) was converted to a variety of heteroaryl ferrocenes, such as 2-thiophenyl, 3-thiophenyl, 3-pyridyl, 3-quinolyl, 4-oxazolyl and 4-isoxazolyl ferrocene, by using Pd-catalyzed reactions. The Stille-coupling catalyst (PdCl2-PPh3) promotes the reaction between Fc-SnBu3 and electron-deficient heterocyclic bromides, while a modified catalyst (Pd-Ph3P-CuO) proves to be the choice for the coupling of Fc-SnBu3 with electron-rich heterocyclic bromides. (C) 2000 Elsevier Science S.A. All rights reserved.