Ring-chain isomerism of ethyl 7-polyfluoroalkyl-7-hydroxy-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylates
作者:Marina V. Pryadeina、Yanina V. Burgart、Viktor I. Saloutin、Oleg N. Chupakhin
DOI:10.1016/j.mencom.2008.09.017
日期:2008.9
Cyclisation of ethyl 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates with 3-amino-1H-[1,2,4]triazole gives ethyl 7-polyfluoroalkyl-7-hydroxy-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylates that are subject to ring-chain isomerisation in solution, depending on the solvent and the length of the polyfluoroalkyl substituent, to yield ethyl 3-polyfluoroalkyl-3-oxo2-([1,2,4]triazol-3-yl)aminomethylidene}propionates via heterocyclic ring opening at the C(7)-N(8) bond.
Synthesis of Fluoroalkylated Dihydroazolo[1,5-a]pyrimidines and Their Ring-Chain Isomerism
作者:Marina V. Goryaeva、Yanina V. Burgart、Victor I. Saloutin、Elena V. Sadchikova、Evgeny N. Ulomskii
DOI:10.3987/com-08-11524
日期:——
polyfluoroalkylated dihydroazolo[1,5-a]pyrimidines. The latter are subject to ring-chain isomerisation in solutions depending on the solvent and the "length" of the fluoroalkyl substituent to yield ethyl 3-polyfluoroalkyl-3-oxo-2-[(azol-3-yl)aminomethylidene]propionates via opening of the heterocycle at the C-N bond. Dehydration of dihydroazolo[1,5-a]pyrimidine were realized.