Synthesis and Reactivity of 1-Pyrroline-5-carboxylate Ester 1-Oxides
摘要:
Some C5 mono- and diester-substituted 1-pyrroline-1-oxides have been prepared via reductive cyclisation of the corresponding gamma-nitro carbonyl compounds. Ethyl 2-phenyl-1-pyrroline-1-oxide-5-carboxylate 5c was regioselectively alkylated at C5. Acylation of this molecule occurs exclusively on the nitrone oxygen and leads to C3 substituted pyrrolines as the result of a hetero-Cope rearrangement. (C) 2000 Elsevier Science Ltd. All rights reserved.
Discovery of benzimidazole derivatives as orally active renin inhibitors: Optimization of 3,5-disubstituted piperidine to improve pharmacokinetic profile
S3 pocket. In the course of modification, renin inhibitory activity was enhanced by the formation of an additional hydrogen bonding with the hydroxyl group of Thr77. Consequently, a series of novel benzimidazole derivatives were discovered as potent and orally bioavailable renininhibitors. Among those, compound 13 exhibited more than five-fold of plasmarenin inhibition than aliskiren in cynomolgus
General method for the synthesis of 5-arylpyrrole-2-carboxylic acids
作者:Jesús Ezquerra、Concepción Pedregal、Almudena Rubio、Jesús Valenciano、José Luis García Navio、Julio Alvarez-Builla、Juan José Vaquero
DOI:10.1016/s0040-4039(00)73741-5
日期:1993.9
5-Arylpyrrole-2-carboxylic acids are prepared by DDQ oxidative aromatization of the corresponding ethyl 2-aryl-Δ1-pyrroline-5-carboxylate followed by basic hydrolysis.
derivatives are also obtained by the reaction of α-bromooximes with vinyl ethers and silyl enol ethers in the presence of Na2CO3. Dihydro-1,2-oxazines can be converted into pyrrole derivatives viareductivedeoxygenation by treating with Fe3(CO)12 in moderate to excellent yields. Iron carbonyl complexes other than Fe3(CO)12 are also effective for the pyrrole-forming reaction. The efficiency of the complexes
The application of vinylogous iminium salts and related synthons to the regiocontrolled preparation of 2,3- and 2,5-disubstituted pyrroles
作者:John T Gupton、Scott A Petrich、Lana L Smith、Marc A Bruce、Phong Vu、Karen X Du、Eric E Dueno、Claude R Jones、James A Sikorski
DOI:10.1016/0040-4020(96)00338-9
日期:1996.5
1-substituted vinamidinium salts with sarcosine ethyl ester produced 2,3-disubstituted pyrroles; a similar reaction with glycine ethyl ester gave 2,5-disubstituted pyrroles. Reactions of related three-carbon synthons with sarcosine and glycine were studied under basic, neutral and acidic conditions which demonstrated the utility of these derivatives for the regiocontrolled preparation of disubstituted pyrroles
Direct metal-free near infra-red photoredox catalysis is applied to organic oxidation, photosensitization and reduction, involving cyanines as photocatalysts. This photocatalyst is competitive with conventional reactions catalyzed under visible light. Kinetic and quenching experiments are also reported. Interestingly, these systems are compatible with water media, opening perspective for various applications