Selective amination of polyhalopyridines catalyzed by a palladium-xantphos complex

Selective amination of polyhalopyridines catalyzed by a palladium-xantphos complex
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DOI:
10.1021/ol0357696
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发表时间:
2003-11-27
期刊:
影响因子:
5.2
通讯作者:
Bunnelle, WH
Bunnelle, WH
中科院分区:
化学1区
文献类型:
--
作者:
Ji, JG;Li, T;Bunnelle, WH

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钯- xantphos络合物催化5-氨基-2-氯吡啶(1a)的胺化反应得到5-氨基-2-氯吡啶产物3a,分离收率为96%,化学选择性良好(3a/4a = 97:3)。2,5-二溴吡啶(11)在相同条件下的胺化反应只得到2-氨基-5-溴吡啶4a。
Amination of 5-bromo-2-chloropyridine (1a) catalyzed by a palladium-Xantphos complex predominately gives 5-amino-2-chloropyridine product 3a in 96% isolated yield and excellent chemoselectivity (3a/4a = 97:3). Amination of 2,5-dibromopyridine (11) under the same conditions exclusively affords 2-amino-5-bromopyridine 4a.