Synthesis of aryl-hydrazones via ultrasound irradiation in aqueous medium
作者:Ana Cristina Lima Leite、Diogo Rodrigo de M. Moreira、Lucas Cunha Duarte Coelho、Frederico Duarte de Menezes、Dalci José Brondani
DOI:10.1016/j.tetlet.2007.12.103
日期:2008.2
The synthesis of aryl-hydrazones from aromatic aldehydes/ketones and hydrazides (semicarbazide, thiosemicarbazide and aminoguanidine) is described using aqueous medium (acid conditions) under ultrasoundirradiation with short reaction times (20–30 min), the reactions occurring at room temperature and giving rise to good to excellent yields of the products, along with the diastereoselectivities. The
Synthesis and Structure−Activity Relationship Study of Potent Trypanocidal Thio Semicarbazone Inhibitors of the Trypanosomal Cysteine Protease Cruzain
作者:Xiaohui Du、Chun Guo、Elizabeth Hansell、Patricia S. Doyle、Conor R. Caffrey、Tod P. Holler、James H. McKerrow、Fred E. Cohen
DOI:10.1021/jm010459j
日期:2002.6.1
American trypanosomiasis, or Chagas' disease, is the leading cause of heart disease in Latin America. Currently there is an urgent need to develop antitrypanosomal therapy due to the toxicity of existing agents and emerging drug resistance. A novel series of potent thio semicarbazone small-molecule inhibitors of the Trypanosoma cruzi cysteine protease cruzain have been identified. Some of these inhibitors have been shown to be trypanocidal. We initially discovered that X-bromopropiophenone thio semicarbazone (1i) inhibited cruzain and could cure mammalian cell cultures infected with T cruzi. 3'-Bromopropiophenone thio semicarbazone showed no toxicity for mammalian cells at concentrations that were trypanocidal. Following this lead, more than 100 compounds were designed and synthesized. A specific structure-activity relationship (SAR) was established, and many potent analogues with IC50 values in the low nanomolar range were identified. Eight additional analogues were trypanocidal in a cell culture assay, and this indicates that aryl thio semicarbazone is a productive scaffold for killing the parasites. Kinetic studies show that these are time-dependent inhibitors. Molecular modeling studies of the enzyme-inhibitor complex have led to a proposed mechanism of interaction as well as insight into the SAR of the thio semicarbazone series. The nonpeptide nature of this series, small size, and extremely low cost of production suggest this is a promising direction for the development of new antitrypanosome chemotherapy.
Butler, Richard N.; O'Donoghue, Denis A., Journal of the Chemical Society. Perkin transactions I, 1982, p. 1223 - 1228
作者:Butler, Richard N.、O'Donoghue, Denis A.
DOI:——
日期:——
BUTLER R. N.; MORRIS G. J.; ODONONUE A. M., J. CHEM. RES. SYNOP., 1981, NO 3, 61, (M 0808-0820)
作者:BUTLER R. N.、 MORRIS G. J.、 ODONONUE A. M.
DOI:——
日期:——
BUTLER, R. N.;ODONOGHUE, D. A., J. CHEM. SOC. PERKIN TRANS., 1982, N 5, 1223-1227