Pyridazine <i>N</i>-Oxides as Photoactivatable Surrogates for Reactive Oxygen Species
作者:Vitalii S. Basistyi、James H. Frederich
DOI:10.1021/acs.orglett.2c00227
日期:2022.3.18
evolution of atomic oxygen from pyridazineN-oxides was developed. This underexplored oxygen allotrope mediates arene C–H oxidation within complex, polyfunctional molecules. A water-soluble pyridazineN-oxide was also developed and shown to promote photoinduced DNA cleavage in aqueous solution. Taken together, these studies highlight the utility of pyridazineN-oxides as photoactivatable O(3P) precursors
开发了一种从哒嗪N-氧化物光诱导析出原子氧的方法。这种尚未开发的氧同素异形体介导复杂的多功能分子内的芳烃 C-H 氧化。还开发了一种水溶性哒嗪N-氧化物,并显示其可促进水溶液中的光诱导 DNA 裂解。总而言之,这些研究强调了哒嗪N-氧化物作为可光活化的 O( 3 P) 前体在有机合成和化学生物学中的应用。
Pyrazole derivatives as potent inhibitors of c-Jun N-terminal kinase: Synthesis and SAR studies
Mitogen activated protein kinases including c-Jun N-terminal kinase play an indispensable role in inflammatory diseases. Investigation of reported JNK-1 inhibitors indicated that diverse heterocyclic compounds bearing an amide group rendered potent JNK-1 inhibitory activity which prompted us to synthesize new JNK-1 inhibitors containing a pyrazole heterocyclic group. A DABCO mediated 1,3-dipolar cycloaddition
Synthesis of Nitrogen Heterocycles via Photochemical Ring Opening of Pyridazine <i>N</i>-Oxides
作者:Maribel Portillo、Michael A. Maxwell、James H. Frederich
DOI:10.1021/acs.orglett.6b02562
日期:2016.10.7
A photochemical method for the direct synthesis of 1H-pyrazoles from pyridazine N-oxides was developed. This chemistry features a regioselective approach to nonsymmetrically substituted pyridazine N-oxides. Herein, we highlight the first strategic use of photoinduced ring-opening reactions of 1,2-diazine N-oxides for the preparative synthesis of nitrogen heterocycles.
1,3-Dipolar cycloadditions of 2-thio-3-chloroacrylamides with diazoalkanes
作者:Marie Kissane、Simon E. Lawrence、Anita R. Maguire
DOI:10.1039/c002479a
日期:——
2-Thio-3-chloroacrylamides undergo 1,3-dipolar cycloadditions with diazoalkanes leading to a series of novel pyrazolines and pyrazoles. The mechanistic and synthetic features of the cycloadditions to the 2-thio-3-chloroacrylamides at both the sulfide and sulfoxide levels of oxidation are rationalised on the basis of the nature of the substituents.