Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202203448
Keywords
Amino Acids; Asymmetric Catalysis; Benzylation; Bimetallic Catalysis; Earth-Abundant Metal
Categories
Funding
- NSFC [21831005, 21901158, 21991112, 22171183]
- National Key R&D Program of China [2018YFE0126800]
- Shanghai Sailing Program [19YF1421900]
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The first asymmetric Ni/Cu cocatalyzed benzylation of aldimine esters is reported, allowing the synthesis of benzyl-substituted alpha-quaternary amino acids in high yield and with high enantioselectivity. The strong electrophilicity of the eta(3)-benzylnickel intermediate was found to be crucial for the high reactivity, enabling the reaction under base-free conditions.
The first asymmetric Ni/Cu cocatalyzed benzylation of aldimine esters is reported. A series of benzyl-substituted alpha-quaternary amino acids could be synthesized in high yield and with high levels of enantioselectivity (up to 90 % yield and 99 % ee). The experimental and theoretical calculation results suggested that the strong electrophilicity of the eta(3)-benzylnickel intermediate is crucial for the high reactivity, enabling the reaction under base-free conditions. Furthermore, this method has been applied to the synthesis of the cell adhesion inhibitor BIRT-377 analogues, and the key intermediate of the NK1 receptor antagonist PD154075 and CCK-B receptor antagonist CI-988.
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