Brønsted Acid-Catalyzed Intramolecular Hydroamination of Protected Alkenylamines. Synthesis of Pyrrolidines and Piperidines
摘要:
[GRAPHIC]The cyclization of aminoalkenes bearing an electron-withdrawing group on the nitrogen atom was catalyzed by triflic or sulfuric acid in toluene. Pyrrolidines and piperidines were formed in excellent yields. N-Phenylanilides also underwent cyclization to form gamma-lactams.
oxidative stress. Here, we describe the synthesis and the activity of new containing bioactive-heterocycles analogues of naftifine as potential T. cruzi membrane sterolbiosynthesisinhibitors. Benzimidazole 1,3-dioxides (11 and 13) and quinoxaline 1,4-dioxides (22 and 23) displayed excellent parasite/mammal selectivity indexes. Analysis of the free sterols from parasite incubated with the compounds
Anhydrolide Macrolides. 1. Synthesis and Antibacterial Activity of 2,3-Anhydro-6-<i>O</i>-methyl 11,12-Carbamate Erythromycin A Analogues
作者:Richard L. Elliott、Daisy Pireh、George Griesgraber、Angela M. Nilius、Patty J. Ewing、Mai Ha Bui、Patti M. Raney、Robert K. Flamm、Ki Kim、Rodger F. Henry、Daniel T. W. Chu、Jacob J. Plattner、Yat Sun Or
DOI:10.1021/jm970547x
日期:1998.5.1
A series of 3-descladinosyl-2,3-anhydro-6-O-methylerythromycin A 11,12-carbamate analogues have been synthesized and evaluated for antibacterial activity. These compounds were found to be potent antibacterial agents against Gram-positive organisms in vitro, many having MIC values below 1 mu g/mL for the macrolide-susceptible Staphylococcus aureus, Streptococcus pyogenes, and Streptococcus pneumoniae, as well as improved activity compared to erythromycin A against the inducibly MLS (macrolide, lincosamide, and streptogramin B)-resistant organisms. Structure-activity studies revealed that arylalkyl carbamates with two and four carbon atoms between the aromatic moiety and carbamate nitrogen have the best in vitro activity. All of the C-10 epi analogues evaluated were found to have substantially less activity than the corresponding natural C-10 isomer. Several analogues demonstrated moderate antibacterial activity against the constitutively resistant S. aureus A-5278, S. pneumoniae 5979, and S. pyogenes 930. However, despite potent in vitro activity, these analogues showed only moderate in vivo activity in mouse protection studies.
Convenient Route to Primary (<i>Z</i>)-Allyl Amines and Homologs
A convenient two-step procedure for the synthesis of primary (Z)-allyl amines, (Z)-homoallyl amines [(Z)-but-3-enylamines], and (Z)-pent-4-enylamines using the Wittig reaction was achieved. The use of nonstabilized ylides from triphenylphosphonium salt, potassium salt, and apolar solvent produced (Z/E)geometric isomer ratios generally greater than 1.6. The amine moiety was masked using a phtalimide group that was removed successfully in the last step of the process in two different conditions, NH2NH2/EtOH/rt or CH3NH2/EtOH/rt. However, in some cases, reduction of the C=C double bond in the deprotection with hydrazine was concomitantly observed.
[EN] 2-(AMINOMETHYL)ARYLAMIDE ANALGESICS<br/>[FR] ANALGESIQUES A BASE DE 2-(AMINOMETHYL)ARYLAMIDE
申请人:PHARMACOPEIA DRUG DISCOVERY
公开号:WO2004071445A2
公开(公告)日:2004-08-26
A chemical genus of 2-(aminomethyl)arylamides, which are useful as analgesics, is disclosed. The genus is represented by the Formula I: a representative example is:
Inter- and Intramolecular Cycloaddition Reactions of Ethenetricarboxylates with Styrenes and Halostyrenes
Inter- and intramolecular cycloaddition reactions of ethenetricarboxylates with styrenes and α-halostyrenes have been investigated. The reactions of ethenetricarboxylates with styrenes or α-bromostyrenes in the presence of SnCl4 or SnBr4 stereoselectively gave 2,4-cis-substituted cyclobutanes. The intramolecular cycloaddition reactions of a series of styrene-functionalized ethenetricarboxylate amides