本文描述了一种简单、温和且高效的连续 KO t Bu/FeCl 3催化的叔酰胺还原膦酰化。该过程首先涉及通过 TMDS(1,1,3,3-四甲基二硅氧烷)将叔酰胺选择性半还原为半缩醛胺中间体,然后是 FeCl 3催化将半缩胺醛中间体亲核加成膦酸酯,其中允许以中等到良好的收率直接合成 α-氨基膦酸酯。该方法适用于不含强酸性α-氢的酰胺和内酰胺,并且可以耐受各种官能团,包括甲氧基、甲硫基、氰基、卤素和杂环。
Compounds having the formula I wherein R
1
, R
2
, R
3
, R
4a
, R
4b
, R
4c
, R
5
, R
6
, R
9
and n are as defined herein are Hepatitis C virus NS5b polymerase inhibitors. Also disclosed are compositions and methods for treating an HCV infection and inhibiting HCV replication.
Compounds having the formula I wherein
wherein R
1
, R
2
and R
3
are as defined herein are Hepatitis C virus NS5b polymerase inhibitors with improved bioavailability. Also disclosed are compositions and methods for treating an HCV infection and inhibiting HCV replication.
Thiourea-Catalyzed Enantioselective Hydrophosphonylation of Imines: Practical Access to Enantiomerically Enriched α-Amino Phosphonic Acids
作者:Guy D. Joly、Eric N. Jacobsen
DOI:10.1021/ja0494398
日期:2004.4.1
Chiral thiourea 1b catalyzes the highly enantioselective hydrophosphonylation of a wide range of N-benzyl imines. The hydrophosphonylation products are readily deprotected by hydrogenolysis, providing access to free alpha-amino phosphonic acids in highly enantioenriched form.