Kinetic evidence for the intermediacy of 1-azirines in the gas-phase thermal isomerization of 3H-isoxazoles to .alpha.-carbonylacetonitrile derivatives
Reactions of N,N-bis(siloxy)enamines with trimethylsilyl cyanide: aliphatic nitro compounds as convenient precursors of 5-aminoisoxazoles
摘要:
A convenient procedure was developed for the synthesis of 5-aminoisoxazoles by the consecutive double silylation and cyanation of aliphatic nitro compounds.
Biphenylsulfonamide Endothelin Antagonists: Structure−Activity Relationships of a Series of Mono- and Disubstituted Analogues and Pharmacology of the Orally Active Endothelin Antagonist 2‘-Amino-<i>N</i>- (3,4-dimethyl-5-isoxazolyl)-4‘-(2-methylpropyl)[1,1‘-biphenyl]-2-sulfonamide (BMS-187308)
作者:Natesan Murugesan、Zhengxiang Gu、Philip D. Stein、Sharon Bisaha、Steve Spergel、Ravi Girotra、Ving G. Lee、John Lloyd、Raj N. Misra、Joan Schmidt、Arvind Mathur、Leslie Stratton、Yolanda F. Kelly、Eileen Bird、Tom Waldron、Eddie C.-K. Liu、Rongan Zhang、Helen Lee、Randy Serafino、Benoni Abboa-Offei、Parker Mathers、Mary Giancarli、Andrea Ann Seymour、Maria L. Webb、Suzanne Moreland、Joel C. Barrish、John T. Hunt
DOI:10.1021/jm970872k
日期:1998.12.1
Substitution at the ortho position of N-(3,4-dimethyl-5-isoxazolyl) benzenesulfonamide led to the identification of the biphenylsulfonamides as a novelseries of endothelin-A (ETA) selective antagonists. Appropriate substitutions on the pendant phenyl ring led to improved binding as well as functional activity. A hydrophobic group such as isobutyl or isopropoxyl was found to be optimal at the 4'-position
Isoxazoles. VII: Hydrolysis of 4-Methyl- 5-isoxazolylnaphthoquinone Derivatives in Aqueous Solutions
作者:Marcela R. Longhi、Maria M. de Bertorello、Margarita C. Brinón
DOI:10.1002/jps.2600800616
日期:1991.6
4-naphthoquinone-4-imine (3) and 5-amino-4-methylisoxazole (4), were isolated. The pathway for degradation of 1 in acidic and neutral pH followed consecutive first-order kinetics since 2 undergoes hydrolysis giving 2-hydroxy-1,4-napthoquinone (6) and 2-methylcyanoacetamide (5). No appreciable buffer effect on the degradation of 1 and 2 was observed for any of the buffer species in this study. The pH-rate
Discovery and Structure-Activity Relationships of Sulfonamide ETA-Selective Antagonists
作者:Philip D. Stein、David M. Floyd、Sharon Bisaha、Joyce Dickey、Ravindar N. Girotra、Jack Z. Gougoutas、Michael Kozlowski、Ving G. Lee、Eddie C.-K. Liu
DOI:10.1021/jm00008a013
日期:1995.4
Random screening of compounds in an ETA receptor binding assay led to the discovery of a class of benzenesulfonamide ligands. Optimization led to the development of 5-amino-N-(3,4-dimethyl-5-isoxazolyl)-1-naphthalenesulfonamides which were functional antagonists. Structural features which were important to activity included a 1,5-substitution pattern on the naphthalene ring; a sulfonamide NH with a pK value < 7; an amine, preferably with alkyl substituents, at the 5-position; and methyl groups on both the 3- and 4-positions of the isoxazole.
Ortiz, C. S.; Longhi, M. R.; Bertorello, M. M. de, Organic Preparations and Procedures International, 1991, vol. 23, # 2, p. 181 - 185
作者:Ortiz, C. S.、Longhi, M. R.、Bertorello, M. M. de、Brinon, M. C.
DOI:——
日期:——
Synthesis of 1,2,6-thiadiazine 1,1-dioxides via isoxazolylsulfamides
作者:Harry A. Albrecht、John F. Blount、Frederick M. Konzelmann、John T. Plati