A new strategy, a transient homocoupling dimer strategy, for direct catalytic oxidative cross-enolate coupling reactions is developed. Cross-enolate coupling products bearing a (contiguous) tetrasubstituted carbon center were obtained chemoselectively without the need for stoichiometric amounts of strong bases/metal oxidants, and thus, the present catalysis provides a general method for the synthesis
Catalyzed by a rhodium complex of P-stereogenic diphosphine ligand trichickenfootphos (TCFP), asymmetric hydrogenation of racemic aldimines via dynamic kineticresolution has been realized for the preparation of chiral arylglycines with good yields and enantioselectivities.
Discovery of new chemical leads of inhibitors for TNF-alpha production starting from the chemical modification of I is reported. Further biological studies of 1 to disclose the site of its action strongly suggested that 1 inhibits LPS-induced TNF-alpha expression in the liver and spleen of mice. Structure-activity relationships (SARs) are also discussed and full details including the chemistry are reported. (C) 2002 Elsevier Science Ltd. All rights reserved.
Discovery of IHMT-MST1-58 as a Novel, Potent, and Selective MST1 Inhibitor for the Treatment of Type 1/2 Diabetes
The transamination of α-keto acids with 2-phenylglycine is an effective methodology for directly synthesizing unprotected α-amino acids. However, the synthesis of 2-arylglycines by transamination is problematic because the corresponding products, 2-arylglycines, transaminate the starting arylglyoxylic acids. Herein, we demonstrate the use of commercially available l-2-(2-chlorophenyl)glycine as the