Stereoconversion of Amino Acids and Peptides in Uryl-Pendant Binol Schiff Bases
作者:Hyunjung Park、Raju Nandhakumar、Jooyeon Hong、Sihyun Ham、Jik Chin、Kwan Mook Kim
DOI:10.1002/chem.200801036
日期:2008.11.10
result. Deuterium exchange of the alpha proton of alanine in the imine form was studied by (1)H NMR spectroscopy and the results support a stepwise mechanism in the L-into-D conversion rather than a concerted one; that is, deprotonation and protonation take place in a sequential manner. The deprotonation rate of L-Ala is approximately 16 times faster than that of D-Ala. The protonation step, however,
Enantioselective Recognition of 1,2-Amino Alcohols by Reversible Formation of Imines with Resonance-Assisted Hydrogen Bonds
作者:Kwan Mook Kim、Hyunjung Park、Hae-Jo Kim、Jik Chin、Wonwoo Nam
DOI:10.1021/ol051267b
日期:2005.8.1
been synthesized. This aldehyde binds a variety of chiral 1,2-aminoalcohols in benzene with the same sense of stereoselectivity. Computational and experimental data indicate that one imine bond, one resonance-assisted H-bond to the imine nitrogen, and two H-bonds to the alcoholic oxygen all play an important role in the stereoselective recognition. [structure: see text]
A novel series of benzoxazole analogs was designed and synthesized, and their inhibitory activities against Aurora kinases were evaluated. Some of the tested compounds exhibited a promising activity with respect to the inhibition of Aurora B kinase. A structure-activityrelationshipstudy indicated that linker length, regiochemistry, and halogen substitution play important roles in kinase inhibitory