The synthesis of amino acids by reaction of an electrophilic glycine cation equivalent with neutral carbon nucleophiles
作者:Martin J. O'Donnell、William D. Bennett
DOI:10.1016/s0040-4020(01)86045-2
日期:1988.1
Seven neutral carbonnucleophiles (active aromatics, allylsilanes, and a silyl enol ether) were reacted with the glycine cation equivalent 12 in the presence of TiCl4to yield α-substituted amino acid derivatives in moderate yield (1 - 61.5 mmolar scale). Deprotection of the Schiff base ester products led to the corresponding amino acids.
Amino acid di- and tri-peptide analogs having C-terminal vinylic groups, pharmaceutical compositions containing the analogs and methods of treating diseases using cysteinyl protease inhibitors; particularly neurodegenerative, autoimmune, cognitive disorders, stroke and traumatic injury.
Preparation of Alkyl Di(<i>p</i>-tolyl)sulfonium Salts and Their Application in Metal-Free C(sp<sup>3</sup>)–C(sp<sup>3</sup>) and C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Bond Formations
Alkyldiarylsulfonium salts were synthesized by a combination of active sulfonium species, prepared through the activation of diarylsulfoxide, and alkyl nucleophiles. The isolated sulfonium salts were subjected to the allylation and cyclopropanation of the active methylene compounds and metal-free C(sp3)–C(sp2) couplings via oxyallyl cation intermediates under mild conditions. The series of reactions
Discovery of (1<i>R</i>,5<i>S</i>)-<i>N</i>-[3-Amino-1-(cyclobutylmethyl)-2,3-dioxopropyl]- 3-[2(<i>S</i>)-[[[(1,1-dimethylethyl)amino]carbonyl]amino]-3,3-dimethyl-1-oxobutyl]- 6,6-dimethyl-3-azabicyclo[3.1.0]hexan-2(<i>S</i>)-carboxamide (SCH 503034), a Selective, Potent, Orally Bioavailable Hepatitis C Virus NS3 Protease Inhibitor: A Potential Therapeutic Agent for the Treatment of Hepatitis C Infection
Hepatitis C virus (HCV) infection is the major cause of chronic liver disease, leading to cirrhosis and hepatocellular carcinoma, which affects more than 170 million people worldwide. Currently the only therapeutic regimens are subcutaneous interferon-alpha or polyethylene glycol (PEG)-interferon-alpha alone or in combination with oral ribavirin. Although combination therapy is reasonably successful with the majority of genotypes, its efficacy against the predominant genotype (genotype 1) is moderate at best, with only about 40% of the patients showing sustained virological response. Herein, the SAR leading to the discovery of 70 (SCH 503034), a novel, potent, selective, orally bioavailable NS3 protease inhibitor that has been advanced to clinical trials in human beings for the treatment of hepatitis C viral infections is described. X-ray structure of inhibitor 70 complexed with the NS3 protease and biological data are also discussed.