Pd-Catalyzed Cross-Coupling Reactions of Amides and Aryl Mesylates
摘要:
A catalyst, based on a biarylphosphine ligand, for the Pd-catalyzed cross-coupling reactions of amides and aryl mesylates is described. This system allows an array of aryl and heteroaryl mesylates to be transformed into the corresponding N-aryl amides in moderate to excellent yields.
Estrone sulfonates as inhibitors of estrone sulfatase
摘要:
In our continuing quest to design efficient inhibitors of estrone sulfatase activity and to assess the recognition of estrone sulfate surrogates by estrone sulfatase, we synthesized and evaluated several sulfonate derivatives of 5,6,7,8-tetrahydronaphth-2-ol and estrone. 5,6,7, 8-Tetrahydronaphth-2-methanesulfonate (II), and 5,6,7, 8-tetra-hydronaphth-2-(p-toluene)sulfonate (12) were found not to inhibit estrone sulfatase activity; estrone-3-methane-sulfonate (5), estrone-3-ethanesulfonate (6), estrone-3-butanesulfonate (7), and estrone-3-[(+)10-camphor]sulfonate (8) all weakly inhibited estrone sulfatase, and the best inhibitor from this class of compounds, was estrone-3-(p-toluene)sulfonate (9). At 10 mu M, it inhibited estrone sulfatase activity by 91%. These results emphasize some of the requirements needed for high-affinity binding to the enzyme. (C) 1997 by Elsevier Science Inc.
Stille Cross-Coupling Reactions of Aryl Mesylates and Tosylates Using a Biarylphosphine Based Catalyst System
作者:Stephen L. Buchwald、John R. Naber、Brett P. Fors、Xiaoxing Wu、Jonathon T. Gunn
DOI:10.3987/com-09-s(s)105
日期:——
A catalystsystem for the Stillecross-couplingreactions of aryl mesylates and tosylates is reported. Using the combination of Pd(OAc)2, XPhos, and CsF in t-BuOH an array of aryl and heteroaryl sulfonates were successfully employed in these reactions. Morever, heteroarylstannanes, such as furyl, thiophenyl, and N-methylpyrrole, which are often prone to decomposition, were efficiently coupled under
(IMIDAZOL-1-YL-METHYL)-PYRIDAZINE AS NMDA RECEPTOR BLOCKER
申请人:F. Hoffmann-La Roche AG
公开号:EP1506190A1
公开(公告)日:2005-02-16
[EN] (IMIDAZOL-1-YL-METHYL)-PYRIDAZINE AS NMDA RECEPTOR BLOCKER<br/>[FR] (IMIDAZOL-1-YL-METHYL)-PYRIDAZINE EN TANT QU'ANTAGONISTE DU RECEPTEUR NMDA
申请人:HOFFMANN LA ROCHE
公开号:WO2003097637A1
公开(公告)日:2003-11-27
The present invention relates to compounds of formula (I) wherein A is an unsubstituted cyclic group; and R is hydrogen or lower alkyl; and pharmaceutically acceptable acid addition salts thereof. It has been shown that the compounds of formulas IA and IB are good NMDA NR-2B receptor subtype specific blockers. Possible therapeutic indications for these compounds include acute forms of neurodegeneration caused, e.g., by stroke and brain trauma, and chronic forms of neurodegeneration such as Alzheimer's disease, Parkinson's disease, Huntington's disease, ALS(amyotrophic lateral sclerosis) and neurodegeneration associated with bacterial or viral infections and, in addition, depression and chronic and acute pain.