L-Thienylalanines were prepared via the hydantoin and azlactone routes with the key step consisting of the microbial transamination of 2-hydroxy-3-thienylacrylic with L-aspartic acid as amino donor. The transamination reaction was performed by a genetically engineered E. coli strain on scales up to 100 g of L-3-(2-thienyl)alanine 1a and is also applicable to the preparation of the isomeric amino acid 1b and some ring-substituted derivatives. (C) 1997 Elsevier Science Ltd.
(Z)-2-N-Acylamino-3-thienyl-acrylic acids and their esters were prepared by known procedures and hydrogenated to the corresponding optically active 2-N-acetyl(or benzoyl)-3-(2- or 3-thienyl)-alanines with optical yields up to 90 % using the rhodium complexes of ''PROPRAPHOS'' 6a,b and O,N-bis(diphenylphosphino)-2-exo-hydroxy,3-endo-methylamino-norbornane 6c as chiral catalysts, Recrystallization and deacylation of the obtained amino acid derivatives yields the optically pure hydrochlorides of the thienylalanines and the free amino acids.
CATIVIELA, C.;DIAZ, DE, VILLEGAS, M. D.;MAYORAL, J. A.;MELENDEZ, E., SYNTHESIS, BRD, 1983, N 11, 899-902
作者:CATIVIELA, C.、DIAZ, DE, VILLEGAS, M. D.、MAYORAL, J. A.、MELENDEZ, E.
DOI:——
日期:——
SELECTIVE ASYMMETRIC HYDROGENATION OF DEHYDROAMINO ACID DERIVATIVES USING RHODIUM AND IRIDIUM DIPHOSPHINITE CARBOHYDRATE CATALYST COMPOSITIONS