Nickel‐Catalyzed Asymmetric Hydrogenation of 2‐Amidoacrylates
作者:Yawen Hu、Jianzhong Chen、Bowen Li、Zhenfeng Zhang、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1002/anie.201916534
日期:2020.3.23
chiral bisphosphine ligand, was found to be an efficientcatalyst for the asymmetric hydrogenation of 2-amidoacrylates, affording the chiral α-aminoacid esters in quantitative yields and excellent enantioselectivity (up to 96 % ee). The active catalyst component was studied by NMR and HRMS, which helped us to realize high catalytic efficiency on a gram scale with a low catalyst loading (S/C=2000).
发现富含地球的镍与合适的手性双膦配体配合使用,是2-酰胺基丙烯酸酯不对称氢化的有效催化剂,以定量收率和优异的对映选择性(高达96%ee)提供了手性α-氨基酸酯。通过NMR和HRMS对活性催化剂组分进行了研究,这有助于我们以克级实现高催化效率且催化剂负载量低(S / C = 2000)。氢化产物可以简单地转化为手性α-氨基酸,β-氨基醇及其生物活性衍生物。此外,使用氘标记实验和计算计算研究了催化机理。
Synthesis and electrochemical behaviour of β-halodehydroamino acid derivatives
作者:Paula M. T. Ferreira、L. S. Monteiro、G. Pereira
DOI:10.1007/s00726-009-0466-x
日期:2010.7
conclude that when N-iodosuccinimide was used as reagent a much higher Z-stereoselectivity is found. The electrochemicalbehaviour of the halogenated dehydroamino acids was studied by cyclic voltammetry. The results show a shift in the reduction peak to higher potentials of the β-halogenated dehydroamino acids when compared with the corresponding non-halogenated derivatives. As expected, the β,β-dihalodehydroalanines