Selective Halogenation of Pyridines Using Designed Phosphine Reagents.
Selective Halogenation of Pyridines Using Designed Phosphine Reagents.
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DOI:
10.1021/jacs.0c04674
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发表时间:
2020-06-24
影响因子:
15
通讯作者:
McNally A
中科院分区:
文献类型:
--
作者:
Levy JN;Alegre-Requena JV;Liu R;Paton RS;McNally A
Halopyridines are key building blocks for synthesizing pharmaceuticals, agrochemicals, and ligands for metal complexes, but strategies to selectively halogenate pyridine C–H precursors are lacking. We designed a set of heterocyclic phosphines that are installed at the 4-position of pyridines as phosphonium salts and then displaced with halide nucleophiles. A broad range of unactivated pyridines can be halogenated, and the method is viable for late-stage halogenation of complex pharmaceuticals. Computational studies indicate that C–halogen bond formation occurs via an SNAr pathway, and phosphine elimination is the rate-determining step. Steric interactions during C–P bond cleavage account for differences in reactivity between 2- and 3-substituted pyridines.
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影响因子:
3.2
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通讯作者:
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影响因子:
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Contreras-Garcia, Julia;Johnson, Erin R.;Keinan, Shahar;Chaudret, Robin;Piquemal, Jean-Philip;Beratan, David N.;Yang, Weitao
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