Abstract
Ethyl 2,2′-bipyridine-5-carboxylate was converted to (2,2′-bipyridine-5-yl)methanol and (S)-1-(2,2′-bipyridine-5-yl)ethanol. The latter synthesis comprised five steps and resolution by HPLC on a chiral stationary phase. Both alcohols were reacted with methyl 1H-imidazole-5-carboxylate in a Mitsunobu reaction to give mixtures of the desired methyl 1-(2,2′-bipyridine-5-yl)alkyl-1H-imidazole-5-carboxylate as main product and the methyl 1-(2,2′-bipyridine-5-yl)alkyl-1H-imidazole-4-carboxylate as side product. The structure of (R)-(−)-methyl 1-(2,2′-bipyridine-5-yl)ethyl-1H-imidazole-4-carboxylate was determined by X-ray structure analysis.
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Acknowledgments
The project was supported by the Austrian National Bank (Jubiläumsfonds Project No. 8680). We thank S. Felsinger for recording the NMR spectra and Dr M. Berger for proofreading the manuscript.
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Ilse Zolle: deceased April 8 2009.
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Schweifer, A., Zolle, I., Wuggenig, F. et al. Synthesis of bipyridine analogues of metomidate for conjugate formation with the 99mTc(I)-tricarbonyl complex. Monatsh Chem 141, 437–443 (2010). https://doi.org/10.1007/s00706-010-0278-4
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DOI: https://doi.org/10.1007/s00706-010-0278-4