Experimental Investigations of a Partial Ru–O Bond during the Metal–Ligand Bifunctional Addition in Noyori-Type Enantioselective Ketone Hydrogenation
摘要:
The transition state for the metal ligand bifunctional addition step in Noyori's enantioselective ketone hydrogenation was investigated using intramolecular trapping experiments. The bifunctional addition between the Ru dihydride trans-[Ru((R)-BINAP)(H())2((R,R)-dpen)] and the hydroxy ketone 4-HOCH2C6H4(CO)CH3 at -80 degrees C exclusively formed the corresponding secondary ruthenium alkoxide trans-[Ru((R)-BINAP)(H)(4-HOCH2C6H4CH(CH3)O)((R,R)-dpen)]. Combined with the results of control experiments, this observation provides strong evidence for the formation of a partial Ru-O bond in the transition state.
Experimental Investigations of a Partial Ru–O Bond during the Metal–Ligand Bifunctional Addition in Noyori-Type Enantioselective Ketone Hydrogenation
摘要:
The transition state for the metal ligand bifunctional addition step in Noyori's enantioselective ketone hydrogenation was investigated using intramolecular trapping experiments. The bifunctional addition between the Ru dihydride trans-[Ru((R)-BINAP)(H())2((R,R)-dpen)] and the hydroxy ketone 4-HOCH2C6H4(CO)CH3 at -80 degrees C exclusively formed the corresponding secondary ruthenium alkoxide trans-[Ru((R)-BINAP)(H)(4-HOCH2C6H4CH(CH3)O)((R,R)-dpen)]. Combined with the results of control experiments, this observation provides strong evidence for the formation of a partial Ru-O bond in the transition state.
Manganese Transfer Hydrogenases Based on the Biotin‐Streptavidin Technology
作者:Weijin Wang、Ryo Tachibana、Zhi Zou、Dongping Chen、Xiang Zhang、Kelvin Lau、Florence Pojer、Thomas R. Ward、Xile Hu
DOI:10.1002/anie.202311896
日期:2023.10.23
Efficient Mn artificialtransferhydrogenases (ATHases) were developed using the biotin-streptavidin technology, which exhibits high activity and enantioselectivity for the transfer hydrogenation of a wide range of aryl ketones. The S112Y-K121 M double mutation and the appropriate chemical structure of the Mn cofactor play critical roles in the reactivity and enantioselectivity of the enzymes.
利用生物素-链霉亲和素技术开发了高效的锰人工转移氢化酶(ATHases),该酶对多种芳基酮的转移氢化表现出高活性和对映选择性。S112Y-K121 M 双突变和 Mn 辅因子的适当化学结构在酶的反应性和对映选择性中发挥着关键作用。