Romazarit. A potential disease-modifying antirheumatic drug
作者:Christopher R. Self、William E. Barber、Peter J. Machin、John M. Osbond、Carey E. Smithen、Brian P. Tong、James C. Wickens、David P. Bloxham、David Bradshaw
DOI:10.1021/jm00106a044
日期:1991.2
biochemical markers (acute phase proteins) associated with the inflammatory response, an effect that was not shared by classical nonsteroidal antiinflammatory agents. Romazarit, (Ro 31-3948, 7), 2-[[2-(4-chlorophenyl)-4-methyl-5-oxazolyl]methoxy]-2-methylpropio nic acid, was selected for further evaluation. In contrast to NSAIDs, romazarit was inactive in animal models of acute inflammation, and furthermore
Anionic <i>N</i>-Heterocyclic Carbene Gold(I) Complexes from Sydnones as a Precarbenic Unit: A Comprehensive Study of the Au–C sp<sup>2</sup> Bond Stability Compared to Its “Relative” Imidazole
作者:Diana E. Vita、María A. Schiel、Marcos J. Lo Fiego、Gustavo F. Silbestri
DOI:10.1021/acs.organomet.3c00486
日期:2024.1.22
A series of sydnones was used as N-heterocycliccarbene (NHC) precursors to synthesize gold(I) complexes by a two-step reaction. The first reaction step involves the deprotonation of the sydnone to obtain the corresponding anionic NHC. Second, the metal precursor was added to afford the corresponding gold(I) complex. At this point, the complex obtained depends on the nature of the metal precursor.
Reactions of anilines with ethyl bromoacetate under microwave irradiation have afforded N-arylglycines that are subsequently converted to their N-nitroso derivatives with a combination of silica chloride or periodic acid, wet SiO2 and sodium nitrite in CH2Cl2 with satisfactory yields. In the final step, the use of 1,3-dibromo-5,5-dimethylhydantoin (DBH) as a new and effective reagent for dehydration of N-nitroso-N-arylglycines to sydnones was successfully examined.
Synthesis of 2<i>H</i>-Indazoles by the [3 + 2] Cycloaddition of Arynes and Sydnones
作者:Chunrui Wu、Yuesi Fang、Richard C. Larock、Feng Shi
DOI:10.1021/ol100586r
日期:2010.5.21
A rapid and efficient synthesis of 2H-indazoles has been developed, which involves the [3 + 2] dipolar cycloaddition of arynes and sydnones. The process proceeds under mild reaction conditions in good to excellent yields.
Synthesis of 2<i>H</i>-Indazoles by the [3 + 2] Dipolar Cycloaddition of Sydnones with Arynes
作者:Yuesi Fang、Chunrui Wu、Richard C. Larock、Feng Shi
DOI:10.1021/jo201605v
日期:2011.11.4
A rapid and efficient synthesis of 2H-indazoles has been developed using a [3 + 2] dipolar cycloaddition of sydnones and arynes. A series of 2H-indazoles have been prepared in good to excellent yields this protocol, and subsequent Pd-catalyzed coupling reactions can be applied to the halogenated products to generate a structurally diverse library of indazoles.