Direct Asymmetric Intramolecular Alkylation of β-Alkoxy-α-amino Esters via Memory of Chirality
摘要:
The intramolecular a-alkylation of beta-alkoxy-alpha-amino esters derived from L-serine proceeded predominantly over beta-elimination. When beta-alkoxy-alpha-amino esters were treated with powdered CsOH in DMSO at 20 degrees C, alpha-alkoxymethyl cyclic amino esters were obtained in up to 94% ee. Optically active THF amino acids were synthesized for the first time by the present method.
Direct Asymmetric Intramolecular Alkylation of β-Alkoxy-α-amino Esters via Memory of Chirality
摘要:
The intramolecular a-alkylation of beta-alkoxy-alpha-amino esters derived from L-serine proceeded predominantly over beta-elimination. When beta-alkoxy-alpha-amino esters were treated with powdered CsOH in DMSO at 20 degrees C, alpha-alkoxymethyl cyclic amino esters were obtained in up to 94% ee. Optically active THF amino acids were synthesized for the first time by the present method.
EnterovirusD68 (EV-D68) virus is a nonpolio enterovirus that typically causes respiratory illness and, in severe cases, can lead to paralysis and death in children. There is currently no vaccine or antiviral for EV-D68. We previously discovered the viral 2A protease (2Apro) as a viable antiviral drug target and identified telaprevir as a 2Apro inhibitor. 2Apro is a viral cysteine protease that cleaves
A class of compounds that inhibit Hepatitis C Virus (HCV) is disclosed, along with compositions containing the compound, and methods of using the composition for treating individuals infected with HCV.
Direct Asymmetric Intramolecular Alkylation of β-Alkoxy-α-amino Esters via Memory of Chirality
作者:Katsuhiko Moriyama、Hiroki Sakai、Takeo Kawabata
DOI:10.1021/ol801213c
日期:2008.9.1
The intramolecular a-alkylation of beta-alkoxy-alpha-amino esters derived from L-serine proceeded predominantly over beta-elimination. When beta-alkoxy-alpha-amino esters were treated with powdered CsOH in DMSO at 20 degrees C, alpha-alkoxymethyl cyclic amino esters were obtained in up to 94% ee. Optically active THF amino acids were synthesized for the first time by the present method.