Green synthesis of new chiral 1-(arylamino)imidazo[2,1-<i>a</i>]isoindole-2,5-diones from the corresponding α-amino acid arylhydrazides in aqueous medium
作者:Nadia Bouzayani、Jamil Kraїem、Sylvain Marque、Yakdhane Kacem、Abel Carlin-Sinclair、Jérôme Marrot、Béchir Ben Hassine
DOI:10.3762/bjoc.14.271
日期:——
New chiral 1-(arylamino)imidazo[2,1-a]isoindole-2,5-dione derivatives were obtained in good to excellent yields via the cyclocondensation of 2-formylbenzoic acid and various α-amino acid arylhydrazides using water as the solvent in the presence of sodium dodecyl sulfate as the surfactant and under simple and minimum manipulation, without purification. The reaction is totally diastereoselective and
Synthesis of 3-Substituted Dihydro-1-phenylamino-1H-pyrrolo[1,2-a]imidazole-2,5(3H,6H)-diones fromα-Amino Acid Phenylhydrazides and Levulinic Acid
作者:Giancarlo Verardo、Paola Geatti、Marcello Merli、Elena E. Castellarin
DOI:10.1002/ejoc.200400112
日期:2004.7
acid to produce the imidazolidin-4-one intermediates 4, which undergo a second ringclosure to afford the dihydro-1H-pyrrolo[1,2-a]imidazole-2,5-dione derivatives 5. It has been established that the solvent polarity has a great influence on the rate of the second condensation reaction, but not on the first. A mechanism, supported by experimental evidence, has been proposed to explain how the imidazolidin-4-one
The natural α-amino acidphenylhydrazides 1a−d readily react with the aldehydes 2a−d and ketones 2e−h to produce the 3-(phenylamino)imidazolidin-4-one derivatives 4 in good yields. Their structures were confirmed by X-ray structural analysis. Polycyclic systems were obtained from the reaction of L-tryptophan phenylhydrazide (1d) and L-histidine phenylhydrazide (1e) with benzaldehyde (2c), which gave