Systematic methodology for the development of biocatalytic hydrogen-borrowing cascades: application to the synthesis of chiral α-substituted carboxylic acids from α-substituted α,β-unsaturated aldehydes
作者:Tanja Knaus、Francesco G. Mutti、Luke D. Humphreys、Nicholas J. Turner、Nigel S. Scrutton
DOI:10.1039/c4ob02282c
日期:——
catalyze the asymmetric reduction of activated carbon–carbon double bonds. In particular, α,β-unsaturated carbonyl compounds (e.g. enals and enones) as well as nitroalkenes are rapidly reduced. Conversely, α,β-unsaturatedesters are poorly accepted substrates whereas free carboxylic acids are not converted at all. The only exceptions are α,β-unsaturated diacids, diesters as well as esters bearing an
Rh-Catalyzed Asymmetric Hydrogenation of Prochiral Olefins with a Dynamic Library of Chiral TROPOS Phosphorus Ligands
作者:Chiara Monti、Cesare Gennari、Umberto Piarulli、Johannes G. de Vries、André H. M. de Vries、Laurent Lefort
DOI:10.1002/chem.200500464
日期:2005.11.4
A library of 19 chiraltroposphosphorusligands, based on a flexible (tropos) biphenol unit and a chiral P-bound alcohol (11 phosphites) or secondary amine (8 phosphoramidites), was synthesized. These ligands were screened, individually and as a combination of two, in the rhodium-catalyzed asymmetrichydrogenation of dehydro-alpha-amino acids, dehydro-beta-amino acids, enamides and dimethyl itaconate
Chemoenzymatic synthesis of a mixed phosphine–phosphine oxide catalyst and its application to asymmetric allylation of aldehydes and hydrogenation of alkenes
作者:Derek R. Boyd、Mark Bell、Katherine S. Dunne、Brian Kelly、Paul J. Stevenson、John F. Malone、Christopher C. R. Allen
DOI:10.1039/c1ob06599h
日期:——
coupling and a novel room temperature Arbuzov [2,3]-sigmatropic rearrangement of an allylic diphenylphosphinite. Allylation of aromatic aldehydes were catalysed by the Lewis basic organocatalyst giving homoallylicalcohols in up to 57% ee. This compound also functioned as a ligand for rhodium-catalysed asymmetric hydrogenation of acetamidoacrylate giving reduction products with ee values of up to 84%.
A comparison of the asymmetric hydrogenation catalyzed by rhodium complexes containing chiral ligands with a binaphthyl unit and those with a 5,5′,6,6′,7,7′,8,8′-octahydro-binaphthyl unit
作者:Fu-Yao Zhang、Wai Him Kwok、Albert S.C. Chan
DOI:10.1016/s0957-4166(01)00399-8
日期:2001.9
The chiral ligands H8–BINAPO and H8–BDPAB were synthesized by reacting chlorodiphenylphosphine with H8–BINOL and H8–BINAM, respectively. Applications of these ligands in the Rh-catalyzed enantioselectivehydrogenation of a variety of (Z)-acetamido-3-arylacrylic acid methyl esters provided chiral amino acid derivatives with good to excellent enantioselectivities (H8–BINAPO: up to 84.0% e.e.; H8–BDPAB:
BENZIMIDAZOLES AND ANALOGS AS RHO KINASE INHIBITORS
申请人:Feng Yangbo
公开号:US20110052562A1
公开(公告)日:2011-03-03
Compounds useful as Rho kinase inhibitors according to formula IA or IB: wherein A, B, D, E, R
1
, R
2
and Ar
1
are as defined herein, and any tautomer, salt, stereoisomer, hydrate, solvent, or prodrug thereof, pharmaceutical compositions, methods of treatment, and synthetic methods are provided.