A highly efficient enantio- and diastereoselective catalyzed asymmetrictransferhydrogenation via dynamic kinetic resolution (DKR–ATH) of α,β-dehydro-α-acetamido and α-acetamido benzocyclic ketones to ent-trans-β-amido alcohols is disclosed employing a new ansa-Ru(II) complex of an enantiomericallypure syn-N,N-ligand, i.e. ent-syn-ULTAM-(CH2)3Ph. DFT calculations of the transition state structures
This invention provides novel indenone derivatives, their pharmaceutical formulations and their use for the inhibition of leukocyte adherence to cells. The indenone derivative is of the formula
where R1 and R2 are each independently hydrogen, hydroxy, nitro, amino, C1-C4 alkyl, C1-C4 alkoxy or halo;
R3 is hydrogen, hydroxy, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, C1-C6 alkoxy, halo, halo (C1-C6 alkyl), unsubstituted or substituted phenyl; and
R4 is hydrogen or C1-C4 alkyl, or a pharmaceutically acceptable salt or solvate thereof; provided that,
when R1, R2 and R4 are each hydrogen, R3 is other than C1-C4 alkyl, halo(C1-C4 alkyl), cyclopropyl or phenyl.
series of novel atropisomeric diphosphine ligands termed TanPhos were designed and synthesized, which has a smaller bite angle compared with that of other ligands such as BINAP. TanPhos showed high reactivity and enantioselectivity in the rhodium-catalyzed asymmetrichydrogenation of a-dehydro amino ketones, and up 99% yield and 99% ee were obtained for a wide range of chiral α-amino ketones.