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2005
Pyridine derivatives
R 0380
Nitropyridyl Isocyanates. — The first preparation of nitropyridyl isocyanates (IV)
(VIII) is achieved by a four-step procedure involving Curtius rearrangement of acyl
33- 154 and
acides (III) and (VII), respectively. Isocyanate (IV) is stable in dry solution at room
temperature for several weeks, whereas isocyanate (VIII) is spectroscopically characterized before trapping as the dimer or as the carbamate (X). Introduction of a nitro
group into the pyridine ring stabilizes the otherwise unstable heterocyclic isocyanate.
— (HOLT, J.; ANDREASSEN, T.; BAKKE, J. M.; FIKSDAHL*, A.; J. Heterocycl.
Chem. 42 (2005) 2, 259-264; Dep. Chem., Norw. Univ. Sci. Technol.,
N-7491 Trondheim, Norway; Eng.) — H. Hoennerscheid
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