据报道,即使在 1% CO 2下,聚吡啶铁基骨架也可用于选择性 CO 2到 CO 的光还原。机理见解揭示了两个连续的单电子转移,在 Fe 和配体上为 CO 2添加提供了具有离域电子密度的中间体。质子辅助的 CO 形成对于 CO 2还原至关重要。悬垂的质子穿梭 α-OH 基团专门将转化转换为 H 2,从而能够在灵活的 CO/H 2比率下形成自分选合成气。
2-Pyridyl and 3-pyridylzinc bromides: direct preparation and coupling reaction
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tet.2010.02.061
日期:2010.4
A facile synthetic approach to the direct preparation of 2-pyridyl and 3-pyridylzinc bromides has been demonstrated usingRieke zinc with 2-bromopyridine and 3-bromopyridine, respectively. A variety of different electrophiles have been coupled with the resulting organozinc reagents to give the corresponding cross-coupling products in moderate to good yields.
Reductive Couplings of 2-Halopyridines without External Ligand: Phosphine-Free Nickel-Catalyzed Synthesis of Symmetrical and Unsymmetrical 2,2′-Bipyridines
作者:Lian-Yan Liao、Xing-Rui Kong、Xin-Fang Duan
DOI:10.1021/jo402084m
日期:2014.1.17
An unexpectedly facile synthetic approach for symmetrical and unsymmetrical 2,2'-bipyridines through the Ni-catalyzed reductive couplings of 2-halopyridines was developed. The couplings were efficiently catalyzed by 5 mol % of NiCl2 center dot 6H(2)O without the use of external ligands. A variety of 2,2'-bipyridines including caerulomycin F have been efficiently synthesized.