Origin of Stereochemistry in the α-Amino Acid Esters and Amides Generated from Optically Active Zirconaaziridine Complexes<sup>1</sup>
作者:Daniel A. Gately、Jack R. Norton
DOI:10.1021/ja953893h
日期:1996.1.1
Methane elimination from ethylenebis(tetrahydroindenyl)(methyl)zirconium amides (R = alkyl or aryl, R‘ = aryl) (S,S)-26 gives a mixture of epimeric zirconaaziridines 25 and 30. When zirconaaziridines with R = alkyl are trapped with ethylene carbonate as they are formed, methyl α-amino acid esters 16 are obtained in poor ee (+14% to −56%); the ee's of 16 reflect the kinetic ratio of 25 to 30. When epimeric
从亚乙基双(四氢茚基)(甲基)锆酰胺(R = 烷基或芳基,R' = 芳基)(S,S)-26 中消除甲烷得到差向异构锆氮丙啶 25 和 30 的混合物。在形成碳酸亚乙酯时,在较差的ee(+14%至-56%)下获得α-氨基酸甲酯16;16 的 ee 反映了 25 到 30 的动力学比。当在加入碳酸亚乙酯之前允许具有 R = 芳基的差向异构锆氮丙啶平衡时,酯 16 的 ee 大于 96%。当 R = 烷基的差向异构 zirconaaziridines 在加入碳酸亚乙酯之前被允许平衡时,在 21-97% ee 中获得 16。当异氰酸酯加入到锆氮丙啶差向异构体 25 和 30 中时,得到的苯基甘氨酰胺的 ee 为 80-99%。ee' 当 R' 为邻茴香基时,酯和酰胺的 s 比当 R' 为 Ph 时更好。 Curtin-Hammett-Winstein-Holness 分析解释了酯和酰胺的立体化学。当差向异构体的平衡混合物
Antiviral compounds
申请人:HAPLOGEN GMBH
公开号:US11091428B2
公开(公告)日:2021-08-17
The present invention relates to novel compounds of general formula (I) wherein the groups X, and R1 to R4 have the meanings given in the description and claims, process for preparing these compounds and their use as for treating, preventing or ameliorating viral infections and their use for treating, preventing or ameliorating diseases which are associated with PLA2G16.
The present invention relates to novel compounds of general formula (I) wherein the groups X, and R1 to R4 have the meanings given in the description and claims, process for preparing these compounds and their use as for treating, preventing or ameliorating viral infections and their use for treating, preventing or ameliorating diseases which are associated with PLA2G16.