发现了一种具有碳酸酐酶抑制作用的新化学型(CA,EC 4.2.1.1),设计了以(磺基)香豆素为铅的高磺基香豆素(3H-1,2-苯并噻吩平2,2-二氧化物)。分子。一组这样的衍生物的原始合成策略导致化合物具有独特的抑制特性,并且相对于胞质(CA I / II)同工型具有非常高的选择性抑制相关肿瘤(CA IX / XII)。尽管目前尚不知道这些新化合物对CA的抑制机制,但我们推测它可能与磺基香豆素相似,即水解成相应的磺酸,然后将其锚定在酶活性位点内的锌配位水分子上。 。
New phenoxybenzylidene ruthenium chelates were synthesised from the second generation Grubbs catalysts bearing a triphenylphosphine ligand (or its para-substituted analogues) by metathesis exchange with substituted 2-vinylphenols. The complexes behave like a latentcatalyst and are characterized by an improved catalytic behaviour as compared to that of the known analogues, i.e., they exhibit high catalytic
behave like a promising latent catalyst of olefinmetathesis. The catalysts are characterised by substantial stability and catalytic inactivity in their dormant forms and a dramatic increase in activity after addition of a solution of HCl in ether. The mechanism of activation involves protonation of the phenoxide and the formation of a highly catalytically active hydroxybenzylidene ruthenium chelate
作者:Marvin Parasram、Viktor O. Iaroshenko、Vladimir Gevorgyan
DOI:10.1021/ja5104525
日期:2014.12.31
A palladium (Pd)-catalyzed endo-selectiveHeckreaction of iodomethylsilyl ethers of phenols and aliphatic alkenols has been developed. Mechanistic studies reveal that this silyl methyl Heckreaction operates via a hybrid Pd-radical process and that the silicon atom is crucial for the observed endo selectivity. The obtained allylic silyloxycycles were further oxidized into (Z)-alkenyldiols.
new cobalt-catalyzed phenolic OH-assisted C–H functionalization of 2-vinylphenols with allenes to give various 2H-chromenes is described. It is the first time that allenes are used as the coupling partners in the cobalt-catalyzed C–H activation reactions. In most cases, cobalt-catalyzed oxidative annulation of arenes with alkenes or alkynes via C–H activation gave [4 + 2] or [3 + 2] cyclization products