- Boryl substitution of functionalized aryl-, heteroaryl- and alkenyl halides with silylborane and an alkoxy base: expanded scope and mechanistic studies
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A transition-metal-free method has been developed for the boryl substitution of functionalized aryl-, heteroaryl- and alkenyl halides with a silylborane in the presence of an alkali-metal alkoxide. The base-mediated boryl substitution of organohalides with a silylborane was recently reported to provide the corresponding borylated products in good to high yields, and exhibit good functional group compatibility and high tolerance to steric hindrance. In this study, the scope of this transformation has been extended significantly to include a wide variety of functionalized aryl-, heteroaryl- and alkenyl halides. In particular, the boryl substitution of (E)- and (Z)-alkenyl halides proceeded smoothly to afford the corresponding alkenyl boronates in good to high yields with retention of the configuration using modified reaction conditions. The results of the mechanistic studies suggest that this boryl substitution proceeds via a carbanion-mediated mechanism.
- Yamamoto, Eiji,Ukigai, Satoshi,Ito, Hajime
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p. 2943 - 2951
(2015/06/17)
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- BENZOTHIAZOLES AND AZA-ANALOGUES THEREOF USE AS ANTIBACTERIAL AGENTS
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The present invention provides Gyrase B and/or Topoisomerase IV par E inhibitors, which can be used as antibacterial agents. Compounds disclosed herein can be used for treating or preventing conditions caused by or contributed by gram positive, gram negative and anaerobic bacteria, more particularly against, for example, Staphylococci, Streptococci, Enterococci, Haemophilus, Pseudomonas spp., Acenetobacter spp., Moraxalla spp., Chlamydia spp., Mycoplasma spp., Legionella spp., Ktycobacterium spp., Helicobacter, Clostridium spp., Bacteroides spp., Coryne bacterium, Bacillus spp., Enterobactericeae,' (E.coli, Klebsiella spp., Proteus spp.,etc. ) or any combination thereof Also provided, are processes for preparing compounds disclosed herein, pharmaceutical compositions containing compounds disclosed herein, and methods of treating bacterial infections. (Formula)
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Page/Page column 35
(2010/01/30)
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- PYRROLE DERIVATIVES USEFUL FOR THE TREATMENT OF CYTOKINE-MEDIATED DISEASES
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A compound of Formula (I) or a pharmaceutically acceptable salt or prodrug ester thereof, wherein the groups R1-R6 and A are as defined in the specification.
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Page/Page column 29
(2008/06/13)
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