Microwave Promoted Synthesis of 4,7-Dihydro-1H-imidazo[4,5-e]-1,2,4-triazepin-8-ones as Ring-expanded Hypoxanthine Analogues
作者:Pierre Raboisson、Bernadette Norberg、J. Richard Casimir、Jean-Jacques Bourguignon
DOI:10.1055/s-2002-20484
日期:——
An efficient method for the synthesis of 4,7-dihydro-1H-imidazo[4,5-e]-1,2,4-triazepin-8-one derivatives was accomplished by the use of microwave methodology. The regioselective alkylation of these compounds to the 1-substituted derivatives is also reported.
作者:Peter Scheiner、Sara Arwin、Manes Eliacin、James Tu
DOI:10.1002/jhet.5570220563
日期:1985.9
1-Aminohypoxanthine (1a), a new positional isomer of guanine, has been obtained from 5-aminoimidazole-4-carboxylic acid hydrazide and triethyl orthoformate. Pyrazolo 11 and triazolo 21 analogues of 1 result from similar reactions of the corresponding o-aminoazole hydrazides. An indirect synthesis involving excess ortho-ester and hydrolysis of the resulting intermediate 6 was found most effective for