为了调节效率并扩展手性改性金属催化剂上不对称氢化的多功能性,非常需要适用于模块结构的合成手性改性剂。简单手性改性剂(R)-1-(1-萘基)-乙胺[(R)-NEA]和升级的仲胺手性改性剂(R,S)-泛酰基萘乙胺[(R,S)-PNEA]已在催化加氢条件下进行了研究。使用衰减全反射红外(ATR-IR)光谱,(R)-NEA和(R,S)-PNEA在技术含量为5 wt%的Pt / Al 2 O 3催化剂的固液界面处进行了研究。除萘基外,(R,S)-PNEA还通过其泛酰基部分锚定在Pt上,从而为酮基内酯(KPL)的不对称氢化提供了增强的锚定作用和更好的手性表面位点。讨论了影响基于NEA的手性改性剂稳定性的因素。最近发现的(R,S)-PNEA,(S)-氨基-4,4-二甲基-二氢呋喃-2-酮[(S)-AF]的手性片段化产物在赋予化合物对映选择性方面不起作用。 KPL不对称氢化。
[EN] COMBINATIONS OF HEPATITIS C VIRUS INHIBITORS<br/>[FR] ASSOCIATIONS D'INHIBITEURS DU VIRUS DE L'HÉPATITE C
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2015005901A1
公开(公告)日:2015-01-15
The present disclosure is generally directed to antiviral compounds, and more specifically directed to combinations of compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such combinations, and methods for inhibiting the function of the NS5A protein.
The present disclosure is generally directed to antiviral compounds, and more specifically directed to combinations of compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such combinations, and methods for inhibiting the function of the NS5A protein.
A compound of the formula
is disclosed as an HIV protease inhibitor. Methods and compositions for inhibiting an HIV infection are also disclosed.
披露了一种公式的化合物作为HIV蛋白酶抑制剂。还披露了用于抑制HIV感染的方法和组合物。
Mechanism-Guided Development of a Highly Active Bis-thiourea Catalyst for Anion-Abstraction Catalysis
作者:C. Rose Kennedy、Dan Lehnherr、Naomi S. Rajapaksa、David D. Ford、Yongho Park、Eric N. Jacobsen
DOI:10.1021/jacs.6b09205
日期:2016.10.19
of a linked, bis-thiourea catalyst with enhanced activity relative to monomeric analogues in a representative enantioselective anion-abstraction reaction. Mechanisticinsights guide development of this linking strategy to favor substrate activation though the intramolecular cooperation of two thiourea subunits while avoiding nonproductive aggregation. The resulting catalyst platform overcomes many of
Efficient method for inversion of secondary alcohols by reaction of chloromethanesulfonates with cesium acetate
作者:Takeshi Shimizu、Sayoko Hiranuma、Tadashi Nakata
DOI:10.1016/0040-4039(96)01333-0
日期:1996.8
Inversion of a variety of secondaryalcohols using the (chloromethylsulfonyl)oxy group as a favorable leaving group with cesiumacetate in the presence of 18-crown-6 has been performed to give the inverted acetates in high yields.