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- W2950797515 abstract "Polyfunctionalized pyrazolo[3,4-c]pyridines were readily prepared by the annulation of alkynes with tert-butyl 4-iodopyrazolocarboximines. The reaction was found to be catalyzed by both NiBr2(PPh3)2/Zn or PdCl2(PhCN)2 to yield complex heterocycles in good to moderate yields. Annulation using nickel catalysis was found to be regio-random, implying that steric control in nickel-catalyzed alkyne insertion has limitations based on the character of the Ni-C bond in the pre-insertion complex." @default.
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- W2950797515 date "2007-11-01" @default.
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- W2950797515 title "Rapid Access to Pyrazolo[3,4-<i>c</i>]pyridines via Alkyne Annulation: Limitations of Steric Control in Nickel-Catalyzed Alkyne Insertions" @default.
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- W2950797515 doi "https://doi.org/10.1021/ol701784w" @default.
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