Asymmetric Biocatalytic Synthesis of 1-Aryltetrahydro-ß-carbolines Enabled by "Substrate Walking".
Chemistry
; 26(69): 16281-16285, 2020 Dec 09.
Article
em En
| MEDLINE
| ID: mdl-33017078
ABSTRACT
Stereoselective catalysts for the Pictet-Spengler reaction of tryptamines and aldehydes may allow a simple and fast approach to chiral 1-substituted tetrahydro-ß-carbolines. Although biocatalysts have previously been employed for the Pictet-Spengler reaction, not a single one accepts benzaldehyde and its substituted derivatives. To address this challenge, a combination of substrate walking and transfer of beneficial mutations between different wild-type backbones was used to develop a strictosidine synthase from Rauvolfia serpentina (RsSTR) into a suitable enzyme for the asymmetric Pictet-Spengler condensation of tryptamine and benzaldehyde derivatives. The double variant RsSTR V176L/V208A accepted various ortho-, meta- and para-substituted benzaldehydes and produced the corresponding chiral 1-aryl-tetrahydro-ß-carbolines with up to 99 % enantiomeric excess.
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Base de dados:
MEDLINE
Assunto principal:
Carbolinas
/
Caminhada
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article