An effective contribution to functionalized pyridines synthesis by way of an unusual rearrangement of amidines
摘要:
A new synthesis of 2-pyridineacetamides was developed starting from pyran-2-one N-functionalized amidines 4. Secondary amines reacted in a sealed tube with amidines 4 and, by nucleophilic attack on pyran-2-one nucleus and thermal rearrangement, afforded exclusively the 2-pyridineacetamide derivatives 6 or a mixture of amide compounds 6 and 7 depending on the substituents linked to C-alpha of the starting amidine 4. (C) 2002 Elsevier Science Ltd. All rights reserved.
ν-Triazolines. Part 42. Study on the reactivity of 4,5-dihydro-1-(6-methyl-2-oxo-2H-pyran-4-yl)-5-morpholino-ν-triazoles. Synthetic approach to pyrano[4,3-b]pyrrol-4(1H)-ones