1281895-44-0Relevant academic research and scientific papers
Chiral lithium binaphtholate for enantioselective amination of acyclic α-alkyl-β-keto esters: Application to the total synthesis of L-carbidopa
Asano, Toshifumi,Moritani, Miyuki,Nakajima, Makoto,Kotani, Shunsuke
, p. 5975 - 5982 (2017)
A chiral lithium binaphtholate catalyzes the enantioselective amination of α-alkyl-β-keto esters with azodicarboxylates to produce optically active α,α-disubstituted α-amino acid derivatives in high yields and with good to high enantioselectivities. A stoichiometric amount of lithium hydroxide efficaciously improved both the reactivity and enantioselectivity of amination. The resulting aminated product is readily convertible to L-carbidopa.
Enantioselective amination of acyclic α-alkylated β-keto esters catalyzed by chiral lithium binaphtholate
Kotani, Shunsuke,Asano, Toshifumi,Moritani, Miyuki,Nakajima, Makoto
supporting information, p. 4217 - 4219 (2016/08/25)
The enantioselective amination of α-alkylated β-keto esters with azodicarboxylates using a chiral dilithium binaphtholate as catalyst affords optically active α,α-disubstituted α-amino acid derivatives in high enantioselectivities of up to 95% ee. A stoichiometric amount of lithium hydroxide accelerates the amination. This method provides easy access to various chiral α,α-disubstituted α-amino acids in high yields and with high enantioselectivities from readily available starting materials and chiral sources.
Asymmetric Synthesis of L-carbidopa based on a highly enantioselective α-amination
Pericas, Lex,Shafir, Alexandr,Vallribera, Adelina
supporting information, p. 1448 - 1451 (2013/06/27)
A stereoselective synthesis of l-carbidopa in seven steps and 50% overall yield from commercial compounds is described. The key step involves a highly enantioselective α-amination reaction of an acyclic β-ketoester with di-tert-butyl azodicarboxylate indu
