期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202305278
关键词
1; 3-Disubstituted Ferrocenes; C-H Activation; Distal Functionalization; Olefination; Palladium Catalysis
In this study, a method for distal C-H functionalization of monosubstituted ferrocenes using an easily removable directing group under a Pd-II/ mono-N-protected amino-acid ligand catalytic system is reported. The synthetic protocol allows for the synthesis of ferrocene 1,3-derivatives with broad scope in olefins, by functionalizing ferrocenyl methylamine in moderate to good yields through a highly strained ferrocene appended 12-membered palladacycle intermediate.
The third position of cyclopentadienyl ring of a monosubstituted ferrocene has remained as an inaccessible chemical space for direct functionalization. Until recently, functionalizing the C(3)-position while bypassing the predominantly active C(2)-position is the most challenging task. Herein, we report a distal C-H functionalization of monosubstituted ferrocenes using an easily removable directing group with precise site-selectivity, under a Pd-II/ mono-N-protected amino-acid ligand catalytic system. The robust synthetic protocol leads to the synthesis of ferrocene 1,3-derivatives with broad scope in olefins while functionalizing ferrocenyl methylamine in moderate to good yields via a highly strained ferrocene appended 12-membered palladacycle intermediate.
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