Deoxygenative Amination of Azine-<i>N</i>-oxides with Acyl Azides via [3 + 2] Cycloaddition
作者:Dongeun Kim、Prithwish Ghosh、Na Yeon Kwon、Sang Hoon Han、Sangil Han、Neeraj Kumar Mishra、Saegun Kim、In Su Kim
DOI:10.1021/acs.joc.9b03173
日期:2020.2.21
an isocyanate from the starting acyl azide via a Curtius rearrangement can trigger a [3 + 2] dipolar cycloaddition of polar N-oxide fragments to generate the aminated azine derivative. The applicability of this method is highlighted by the late-stage and sequential amination reactions of complex bioactive compounds, including quinidine and fasudil. Moreover, the direct transformation of aminated azines
[EN] FLOW CHEMISTRY SYNTHESIS OF ISOCYANATES<br/>[FR] SYNTHÈSE CHIMIQUE EN FLUX D'ISOCYANATES
申请人:UNIV CALIFORNIA
公开号:WO2021119606A1
公开(公告)日:2021-06-17
The disclosure provides, inter alia, safe and environmentally-friendly methods, such as flow chemistry, to synthesize isocyanates, such as methylene diphenyl diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and tetramethylxylene diisocyanate.
Direct Synthesis of Acyl Azides
from Carboxylic Acids by the Combination of Trichloroacetonitrile,
Triphenylphosphine and Sodium Azide
作者:Doo Jang、Joong-Gon Kim
DOI:10.1055/s-2008-1077979
日期:——
Various carboxylic acids were converted into acyl azides in excellent yields by treating with trichloroacetonitrile, triphenylphosphine and sodiumazide at room temperature. The reaction was applicable to the preparation of dipeptide without rearrangement.
Boc-Protected Amines via a Mild and Efficient One-Pot Curtius Rearrangement
作者:Hélène Lebel、Olivier Leogane
DOI:10.1021/ol051428b
日期:2005.9.1
[reaction: see text] The reaction of a carboxylic acid with di-tert-butyl dicarbonate and sodium azide allowed the formation of an acyl azide intermediate, which undergoes a Curtiusrearrangement in the presence of tetrabutylammonium bromide and zinc(II) triflate. The trapping of the isocyanate derivative in the reaction mixture led to the desired tert-butyl carbamate in high yields at low temperature
In this paper, a series of novel abietyl and dehydroabietyl ureas, thioureas, amides, and thioamides bearingadamantanemoieties were designed, synthesized, and evaluated for their inhibitory activities against tyrosil-DNA-phosphodiesterase 1 (TDP1). The synthesized compounds were able to inhibit TDP1 at micromolar concentrations (0.19–2.3 µM) and demonstrated low cytotoxicity in the T98G glioma cell