Practical Chemoselective Acylation: Organocatalytic Chemodivergent Esterification and Amidation of Amino Alcohols with
<i>N</i>
‐Carbonylimidazoles
作者:Hope Nelson、William Richard、Hailee Brown、Abigail Medlin、Christina Light、Stephen T. Heller
DOI:10.1002/anie.202107438
日期:2021.10.11
DBU-catalyzed esterification: A single esterification product was obtained from a molecule containing primary aniline, alcohol, phenol, secondary amide, and N−H indole groups. These acylation reactions are highly practical as they involve only readily available, inexpensive, and relatively safe reagents; can be performed on a multigram scale; and can be used on carboxylic acids directly by in situ formation
SAR studies on 1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles as inhibitors of Mtb shikimate dehydrogenase for the development of novel antitubercular agents
作者:Ziqiang Li、Yishuang Liu、Xiaoguang Bai、Qi Deng、Juxian Wang、Guoning Zhang、Chunling Xiao、Yaning Mei、Yucheng Wang
DOI:10.1039/c5ra19334f
日期:——
Triazolothiadiazoles are potent antitubercular agents with modest inhibitory forMtSD and without appreciable cytotoxicity.
三唑噻二唑是一种具有较强抗结核活性的药物,对MtSD有适度的抑制作用,并且没有明显的细胞毒性。
Combined Photoredox and Carbene Catalysis for the Synthesis of Ketones from Carboxylic Acids**
作者:Anna V. Bay、Keegan P. Fitzpatrick、Rick C. Betori、Karl A. Scheidt
DOI:10.1002/anie.202001824
日期:2020.6.2
development of a novel single-electron reduction of acyl azoliums for the formation of ketones from carboxylic acids. Facile construction of the acyl azolium in situ followed by a radical-radical coupling was made possible merging N-heterocyclic carbene (NHC) and photoredox catalysis. The utility of this protocol in synthesis was showcased in the late-stage functionalization of a variety of pharmaceutical compounds
Imidazole-Catalyzed Monoacylation of Symmetrical Diamines
作者:Sanjeev K. Verma、B. N. Acharya、M. P. Kaushik
DOI:10.1021/ol101604q
日期:2010.10.1
An imidazole-catalyzed protocol for monoacylation of symmetricaldiamines has been developed. The protocol gave selective monoacylation of aliphatic (cyclic and acyclic) primary and secondary diamines. In the reaction, imidazole acts as both catalyst and a leaving group. Different monoacylated piperazines and other diamines were synthesized at room temperature in an ethanol/water solvent system.
<i>N</i>-Methylimidazole-catalyzed Synthesis of Carbamates from Hydroxamic Acids via the Lossen Rearrangement
作者:Sabesan Yoganathan、Scott J. Miller
DOI:10.1021/ol303424b
日期:2013.2.1
An efficient, one-pot, N-methylimidazole (NMI) accelerated synthesis of aromatic and aliphatic carbamates via the Lossenrearrangement is reported. NMI is a catalyst for the conversion of isocyanate intermediates to the carbamates. Moreover, the utility of arylsulfonyl chloride in combination with NMI minimizes the formation of often-observed hydroxamate-isocyanate dimers during the sequence. Under