Biomedical subjects
Publications and source records attributed to Andrea Vaupel.
We report the solid-phase synthesis and pharmacological evaluation of a new series of small-molecule agonists of the human peroxisome proliferator-activated receptor delta (PPARdelta) based on a lead structure from our PPARalpha program. Compound 33 showed good pharmacokinetics.
Vitronectin receptor (alpha(V)beta(3)) antagonism has been implicated in a variety of disease states, like restenosis, osteoporosis and cancer. In this work, we present the development of a novel class of biphenyl vitronectin receptor antagonists. Identified from a focused combinatorial library based on para-bromo phenylalanine, these compounds show nanomolar affinity to the vitronectin receptor and display unprecedented SAR. Their binding mode can be rationalized by computational docking studies using the X-ray structure of alpha(V)beta(3).
Vitronectin receptor (alpha(V)beta(3)) antagonism has been implicated as a mechanism for the treatment of restenosis following balloon angioplasty. In this work we present results from screening of a focused combinatorial library based on a biphenyl moiety. Our SAR studies led to the identification of compounds with subnanomolar activity, selectivity towards the related GPIIbIIIa receptor and functional activity on human smooth muscle cell migration.
The reaction of primary alkyl bromides or chlorides with diethylzinc in the presence of Ni(acac)(2) (5 mol %) furnishes the corresponding alkylzinc halides (X = Br, Cl) via a halogen-zinc exchange reaction. The treatment of terminal alkenes with diethylzinc (neat, 25-60 degrees C) in the presence of Ni(acac)(2) as a catalyst (1-5 mol %) and 1,5-cyclooctadiene (COD) affords the corresponding dialkylzincs via a hydrozincation reaction. Whereas the conversion for simple alkenes bearing a remote functionality reaches 40 to 63%, the hydrozincation of allylic, homoallylic alcohols and allylic amines proceeds very efficiently (85-95% conversion). All the zinc organometallics obtained react with various electrophiles (allylic halides, enones, acid chlorides, alkynyl halides, ethyl propiolate) after transmetalation with CuCN.2LiCl. In the presence of the chiral catalyst 12, the dialkylzincs prepared add to aldehydes with high enantioselectivity.