Ru(II) coordination compounds of N N bidentate chelators with 1,2,3 triazole and isoquinoline subunits: Synthesis, spectroscopy and antimicrobial properties
摘要:
Bidentate chelators 1 -(1-benzyl-1,2,3-triazol-4-yl)isoquinoline and 3-(1-benzyl-1,2,3-triazol-4-yl)isoquinoline were prepared from benzyl bromide and trimethylsilylethynylisoquinoline precursors using a tandem deprotection/substitution/CuAAC synthetic approach. Each chelator is capable of forming a stable 3:1 Ru(II) coordination compound, which forms as a geometric isomer mixture. These Ru(II) complexes possess unique MLCT absorbance signatures at 450/472 nm (1-isomer) and 367 nm (3-isomer) relative to their constituent chelating units. Minimum inhibitory concentration values as low as 0.4 mu M are observed for Ru(II) complexes against representative Gram-positive bacteria Bacillus subtilis and Staphylococcus epidermidis. Comparing the MIC values of these isoquinoline compounds with analogous 2-(1-benzyl-1,2,3-triazol-4-yl)pyridine compounds shows a 2.5- to 40-fold improvement in potency. This study establishes that increased hydrophobicity introduced at the central chelating units of Ru(II) coordination compounds can be a useful means by which to optimize antimicrobial activity that is complimentary to the variation of peripheral substituent identity at the chelator's N1 triazole position. (C) 2019 Elsevier Ltd. All rights reserved.
the application! An enantioselective synthesis of axially chiral 1‐arylisoquinolines has been achieved, which involves a rhodium‐catalyzed [2+2+2] cycloaddition of diphenylphosphinoyl‐substituted 1‐arylisoquinolines (see scheme). The new diphenylphosphinoyl‐substituted axially chiral 1‐arylisoquinolines were successfully derivatized to the corresponding axially chiral P,Nligand and Lewis base catalyst
Palladium-catalyzed coupling of heteroaromatic triflates with acetylene and its application for a dynemicin a intermediate
作者:Takaaki Okita、Minoru Isobe
DOI:10.1016/0040-4020(95)00118-r
日期:1995.3
An acetylene moiety was introduced to a carbonyl carbon of amide group via its triflate in the presence of palladium catalyst, The reaction proceeded smoothly under mild conditions. Utilizing this methodology, a model compound of dynemicin A bearing acetylene group was synthesized.