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。
Nickel-Catalyzed Asymmetric Transfer Hydrogenation of Olefins for the Synthesis of α- and β-Amino Acids
作者:Peng Yang、Haiyan Xu、Jianrong Steve Zhou
DOI:10.1002/anie.201407744
日期:2014.11.3
The field of asymmetric (transfer) hydrogenation of prochiral olefins has been dominated by noble metal catalysts based on rhodium, ruthenium, and iridium. Herein we report that a simple nickel catalyst is highly active in the transfer hydrogenation using formic acid. Chiral α‐ and β‐amino acid derivatives were obtained in good to excellent enantioselectivity. The key toward success was the use of
Chemoenzymatic synthesis of a novel ligand for rhodium-catalysed asymmetric hydrogenation
作者:Brian Adger、Ulrich Berens、Matthew J. Griffiths、Michael J.K elly、Ray McCague、John A. Miller、Christopher F. Palmer、Stanley M. Roberts、Rüdiger Selke、Ute Vitinius、Guy Ward
DOI:10.1039/a704136e
日期:——
The hydrogenation of alkenes 7a–g using a chiral rhodium catalyst
6 (based on a bicyclo[3.2.0]heptane framework) takes place to give the
phenylalanine derivatives 8a–g with remarkably high
stereoselectivity (59–92% ee).