Tandem <i>N</i>,<i>N</i>-Dialkylation Reaction of <i>N</i>-Trimethylsilyl α-Iminoesters Utilizing an Umpolung Reaction and Characteristics of the Silyl Substituent: Synthesis of Pyrrolidine, Piperidine, and Iminodiacetate
with organometallics gave directly N-alkylaminoesters in high yields without the need for removing a protecting group at the nitrogen atom. Efficient syntheses of pyrrolidines, piperidines, and iminodiacetate derivatives were also developed via tandem N,N- or N,C-dialkylation reactions utilizing characteristics of the silyl substituent. Furthermore, under the influence of silica gel, the addition of
Free Amino Group-Directed γ-C(sp<sup>3</sup>)–H Arylation of α-Amino Esters with Diaryliodonium Triflates by Palladium Catalysis
作者:Pranab K. Pramanick、Zhibing Zhou、Zhen-Lin Hou、Bo Yao
DOI:10.1021/acs.joc.9b00605
日期:2019.5.3
Free amino group-directed C(sp3)–H functionalization of aliphatic amines is a fundamental challenge in synthetic organic chemistry. Also, the NH2-directed C(sp3)–H functionalization of α-amino acids and their derivatives remains barely explored. With palladium as the catalyst and Ag2O as the additive, we developed the first NH2-directed γ-C(sp3)–Harylation of α-amino esters with diaryliodonium triflates
Substituted 2, 4-imidazolidinedione compounds as pharmaceutical active
申请人:Gruenenthal GmbH
公开号:US06004963A1
公开(公告)日:1999-12-21
A substituted 2,4-imidazolidinedione compound corresponding to the formula I ##STR1## a process for production thereof and the use of these compounds in a pharmaceutical preparation are described. Substituents R1, R2, R3 and R4 have the same meaning as defined in the specification.
Compounds effective in inhibiting replication of Hepatitis C virus (“HCV”) or other viruses are disclosed. This invention is also directed to compositions comprising such compounds, co-formulation or co-administration of such compounds with other anti-viral or therapeutic agents, processes and intermediates for the syntheses of such compounds, and methods of using such compounds for the treatment of HCV or other viral infections.
Unique salts of trimebutine and N-monodesmethyl trimebutine, and their corresponding stereoisomers, having improved analgesic properties useful in the treatment of visceral pain are provided. The salts of the present invention are particularly useful in the treatment of conditions characterized by abdominal pain, such as inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS), diabetic gastroparesis, and dyspepsia.