We hereby report the first preparation of 3-nitro-4-pyridyl isocyanate 9 and 5-nitro-2-pyridyl isocyanate 18. They were formed by Curtius rearrangement of the corresponding acyl azides 8 and 17, prepared from methyl 3-nitro-4-pyridinecarboxylate 6 via the hydrazide 7 and 5-nitro-picolinic acid 16, respectively. The substrates 6 and 16 were generated by nitration of methyl 4-pyridinecarboxylate 5 and nitration and oxidation of 2-picoline 14. 3-Nitro-4-pyridyl isocyanate 9 can be stored in dry solution and is stable at room temperature for several weeks while 5-nitro-2-pyridyl isocyanate 18 was less stable and should be used for synthetic purposes immediately.
Holt, Jarle,Andreassen, Trygve,Bakke, Jan M.,Fiksdahl, Anne
p. 259 - 264
(2007/10/03)
Synthesis of DL-slaframine
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Schneider,Harris
p. 3681 - 3684
(2007/10/02)
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