Oxygen Insertion of o-Quinone under Catalytic Hydrogenation Conditions
摘要:
An oxygen-insertion reaction that transforms an o-quinone and a conjugated alpha-diketone substrate Into an anhydride product or derivative under catalytic hydrogenation conditions is reported. The experiments and computations indicate that the oxygen insertion proceeds via a radical mechanism mediated by an acetoxyl radical.
Fused imidazoles as potential chemical scaffolds for inhibition of heat shock protein 70 and induction of apoptosis. Synthesis and biological evaluation of phenanthro[9,10-d]imidazoles and imidazo[4,5-f][1,10]phenanthrolines
作者:Alpa Patel、Swee Y. Sharp、Katelan Hall、William Lewis、Malcolm F. G. Stevens、Paul Workman、Christopher J. Moody
DOI:10.1039/c6ob00471g
日期:——
Fused imidazoles inhibit growth of human cancer cell lines, and the Hsp70 pathway in cells, and induce apoptosis.
Synthesis and Photophysics of Dibenz[<i>a</i>,<i>c</i>]phenazine Derivatives
作者:Leandro A. Estrada、Douglas C. Neckers
DOI:10.1021/ol200354t
日期:2011.7.1
The synthesis of dipolar dibenz[a,c]phenazine (DBP) derivatives is described. The compounds possess little electronic communication between donor and acceptor units in the ground state regardless of the pattern of substitution. The dipolar derivatives deactivate mostly via electron transfer (eT) under polar conditions. Intersystem crossing is likely to compete for S1 relaxation.
White‐Fluorescent Dual‐Emission Mechanosensitive Membrane Probes that Function by Bending Rather than Twisting
作者:Heorhii V. Humeniuk、Arnulf Rosspeintner、Giuseppe Licari、Vasyl Kilin、Luigi Bonacina、Eric Vauthey、Naomi Sakai、Stefan Matile
DOI:10.1002/anie.201804662
日期:2018.8.13
Bent N,N′‐diphenyl‐dihydrodibenzo[a,c]phenazine amphiphiles are introduced as mechanosensitivemembraneprobes that operate by an unprecedented mechanism, namely, unbending in the excited state as opposed to the previously reported untwisting in the ground and twisting in the excited state. Their dualemission from bent or “closed” and planarized or “open” excited states is shown to discriminate between
弯曲的N,N'-二苯基-二氢二苯并[a,c]吩嗪两亲物被引入作为机械敏感膜探针,其通过前所未有的机制工作,即在激发态下不弯曲,而不是之前报道的在地面中不扭曲和在室温下扭曲。兴奋状态。它们从弯曲或“闭合”和平面化或“开放”激发态的双重发射被证明可以区分水中的胶束和固序(S o )、液体无序(L d )和本体膜中的单体。双发射光谱覆盖了足够的可见光范围,以产生发出带有比例编码信息的白光的囊泡。报告了通过扩展 π 系统和助色团来改善弯曲机械载体的策略,并证明了与双光子激发荧光 (TPEF) 显微镜对巨型单层囊泡中膜域成像的兼容性。
Phenanthrylene-butadiynylene and Phenanthrylene-thienylene Macrocycles: Synthesis, Structure, and Properties
A series of macrocycles consisting of 9,10-substituted phenanthrenes connected by butadiynylene linkers in positions 3 and 6 has been described as well as their transformation into the corresponding phenanthrylene-thienylene macrocycles. Structure and properties of the macrocycles, such as self-association in solution and optical and electrochemical properties, were studied and reported in a comparative