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- W2080321023 abstract "Abstract A novel methodology for the efficient and selective synthesis of isomers A and B of N ‐substituted dihydrodipyridopyrazines was developed. The key step is the intermolecular coupling of aminopyridines and halonitropyridines/dihalopyridines in the presence of a catalyst system composed of Pd(OAc) 2 /Xantphos. This system displays good functional group compatibility and the desired C–N bond‐forming process proceeds in good yields. Cyclization of suitable nitro‐substituted N , N′ ‐dipyridinylamines produces monosubstituted dihydrodipyridopyrazines, which can easily be alkylated to give a large variety of unsymmetrical 5,10‐dialkyl‐5,10‐dihydrodipyrido[2,3‐ b :2′,3′‐ e ]pyrazines (isomers A ) and 5,10‐dialkyl‐5,10‐dihydrodipyrido[2,3‐ b :3′,2′‐ e ]pyrazines (isomers B ). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
- W2080321023 created "2016-06-24" @default.
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- W2080321023 date "2009-07-14" @default.
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- W2080321023 title "Efficient and Selective Method for the Synthesis of Dihydrodipyridopyrazines Based on the Pd‐Catalysed Amination of Halopyridines" @default.
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- W2080321023 doi "https://doi.org/10.1002/ejoc.200900404" @default.
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