Compounds for inhibition of ceramide-mediated signal transduction
申请人:The Regents of the University of California
公开号:US20020165202A1
公开(公告)日:2002-11-07
Novel, heterocyclic compounds having at least one ring nitrogen, disclosed side chains and, in some embodiments, an oxygen ortho to the ring nitrogen inhibit inflammatory responses associated with TNF-&agr; and fibroblast proliferation in vivo and in vitro. The compounds of the invention neither appreciably inhibit the activity of cAMP phosphodiesterase nor the hydrolysis of phosphatidic acid, and are neither cytotoxic nor cytostatic. Preferred compounds of the invention are esters. Methods for the use of the novel compounds to inhibit ceramide-mediated intracellular responses in stimuli in vivo (particularly TN-&agr;) are also described. The methods are expected to be of use in reducing inflammatory responses (for example, after angioplasty), in limiting fibrosis (for example, of the liver in cirrhosis), in inhibiting cell senescence, cell apoptosis and UV induced cutaneous immune suppression. Compounds having enhanced water solubility are also described.
The nitrosoDiels-Alder (NDA) reaction is an attractive strategy for the synthesis of 3,6-dihydro-1,2-oxazines and 1-amino-4-hydroxy-2-ene derivatives. Herein we report the Cu(I)-DTBM-Segphos catalyzed asymmetric intermolecular NDA reaction of variously substituted cyclic 1,3-dienes using highly reactive nitroso compounds derived from pyrimidine and pyridazine derivatives. In most of the cases studied
Preparation and biological evaluation of novel leucomycin analogs derived from nitroso Diels–Alder reactions
作者:Baiyuan Yang、Tina Zöllner、Peter Gebhardt、Ute Möllmann、Marvin J. Miller
DOI:10.1039/b922450e
日期:——
A series of 10,13-disubstituted 16-membered macrolides was synthesized using nitroso DielsâAlder reactions of leucomycin A7. Despite the extensive constituent functionalities in leucomycin, the hetero cycloaddition reactions proceeded in a highly regio- and stereoselective fashion. Subsequent chemical modifications of the nitroso cycloadducts, including NâO bond reduction, were also conducted. Most leucomycin derivatives retained antibiotic profiles similar to leucomycin A7, and, in contrast to leucomycin itself, several exhibited moderate antiproliferative and cytotoxic activity.
A highly efficient enantioselective Nitroso Diels-Alderreactions of 6-methyl-2-nitroso pyridine with various 1,3-dienes were successfully developed with Cu(I)/(S)-TF-BiphamPhos complex as the catalyst. For most of the cyclic dienes, the synthetically...