Zobrazeno 1 - 10
of 63
pro vyhledávání: '"H.-J. Kreuzfeld"'
Autor:
H.‐J. Kreuzfeld, M. Beller
Publikováno v:
Catalysis from A to Z.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dcc910ba7f91999921e4b98b455c0647
https://doi.org/10.1002/9783527809080.cataz02296
https://doi.org/10.1002/9783527809080.cataz02296
Publikováno v:
Amino Acids. 22:325-331
N-[(Z)-N-Benzoyl- or N-boc-(2-fluorophenyl)dehydroalanyl]-(R)- or (S)-phenyl-alanines 1,2,5 and 6 were hydrogenated in the presence of chiral and achiral rhodium complexes. The optical induction is compared to the results obtained using the correspon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::715e57f3a731970209e1f1363c01a9f3
https://doi.org/10.1007/s007260200018
https://doi.org/10.1007/s007260200018
Publikováno v:
Tetrahedron Letters. 41:3821-3824
The first transition metal-catalysed racemisation of N-acyl α-amino acids, which is of importance for kinetic resolution processes, is described. Enantiomerically pure N-acyl α-amino acids were efficiently racemised under mild conditions using vari
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a65b2e95f299a5c34965eb3a72e5c2c4
https://doi.org/10.1016/s0040-4039(00)00539-6
https://doi.org/10.1016/s0040-4039(00)00539-6
Publikováno v:
Amino Acids. 16:21-27
(Z)-alpha-[(Benzyloxy)- or (tert.-butyloxy)carbonylamino]-beta (thienyl)- or (furyl)-acrylic acids and their esters were prepared by known methods and hydrogenated to the corresponding optically active alanine derivatives with optical yields in the r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3256f7c915f7b8b9a7cd2afa7def63ee
https://doi.org/10.1007/bf01318882
https://doi.org/10.1007/bf01318882
Publikováno v:
Chirality. 10:535-539
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6dc8a505be20ff6397c33e507950bc5d
https://doi.org/10.1002/(sici)1520-636x(1998)10:6<535::aid-chir6>3.0.co
https://doi.org/10.1002/(sici)1520-636x(1998)10:6<535::aid-chir6>3.0.co
Publikováno v:
Tetrahedron: Asymmetry. 7:1011-1018
The enantiomers of PINDOPHOS, the aminophosphine phosphinite derivative of the commercial s-blocker Pindolol, were prepared and used as ligands in the rhodium catalyzed asymmetric hydrogenation of non-proteinogenic amino acid precursors. The isolated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::982e6d0e55b0a0cdb0e184aa19b12e6b
https://doi.org/10.1016/0957-4166(96)00105-x
https://doi.org/10.1016/0957-4166(96)00105-x
Publikováno v:
Tetrahedron: Asymmetry. 7:117-125
( Z )-2- N -Acylamino-3-pyridyl-acrylic acids and their esters were prepared by partially known procedures and hydrogenated in the presence of HBF 4 to the corresponding optically active 2- N -acetyl-(or benzoyl-)-3-(3- or 4-pyridyl)-alanines or anal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::526bc2c40c2eefbb4b9cb2501dbcfe4d
https://doi.org/10.1016/0957-4166(95)00428-9
https://doi.org/10.1016/0957-4166(95)00428-9
Autor:
Chr Döbler, Ch. Fischer, Manfred Michalik, H.-J. Kreuzfeld, S. Taudien, Ute Schmidt, H.W. Krause
Publikováno v:
Chirality. 8:173-188
Substituted N-Cbz and N-Boc protected arylamino acrylic acids and esters have been prepared and used in asymmetric hydrogenations catalyzed by PROPRAPHOSRh. Stereoselectivities > 90% ee could be achieved, the rate of which is dependent on the positio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68cfec043653c4ccb29660a6c2ea6203
https://doi.org/10.1002/(sici)1520-636x(1996)8:2<173::aid-chir2>3.0.co
https://doi.org/10.1002/(sici)1520-636x(1996)8:2<173::aid-chir2>3.0.co
Publikováno v:
Tetrahedron: Asymmetry. 6:3039-3045
α-Chymotrypsin (EC 3.4.21.1) was used for catalyzing the reaction of various N α -unprotected non-coded phenylalanine ester derivatives with H-Leu-NH 2 and H-Arg-NH 2 in frozen aqueous solution at −15 °C. Compared with reactions at room temperat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd974dc87320516898905a5b3585ee1a
https://doi.org/10.1016/0957-4166(95)00401-7
https://doi.org/10.1016/0957-4166(95)00401-7
Publikováno v:
Tetrahedron: Asymmetry. 6:385-388
Crystalline and in situ formed Rh-complexes from (1 R ,3 R ,5 R )-O,N-bis-(diphenylphosphino)-3-hydroxymethyl-2-azabicyclo-[3.3.0.]-octane and from the all ( S )-enantiomer have been prepared and used in model asymmetric hydrogenations. The catalysts
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a34d7c869fc87e23d4a942636c96928
https://doi.org/10.1016/0957-4166(95)00020-p
https://doi.org/10.1016/0957-4166(95)00020-p