Metal-Free Synthesis of Fluorinated Indoles Enabled by Oxidative Dearomatization
作者:Edon Vitaku、David T. Smith、Jon T. Njardarson
DOI:10.1002/anie.201511149
日期:2016.2.5
fluorinated drugs is increasing each decade. Therefore, new approaches for accessing fluorinated nitrogen heterocycles are of great significance. A novel, scalable, and metal‐free method for accessing a wide range of fluorinated indoles is described. This oxidative‐dearomatization‐enabled approach assembles 2‐trifluoromethyl NH‐indole products fromsimple commercially available anilines with hexafluoroacetylacetone
Indium(III) Halides as New and Highly Efficient Catalysts for <i>N</i>-<i>tert</i>-Butoxycarbonylation of Amines
作者:Asit Chakraborti、Sunay Chankeshwara
DOI:10.1055/s-2006-942492
日期:2006.8
Indium(III) bromide and chloride efficiently catalysed the N-tert-butoxycarbonylation of amines with (Boc)2O at room temperature and under solvent-free conditions. Various aromatic, heteroaromatic and aliphatic amines were converted to N-tert-butylcarbamates in excellent yields in short times. Chiral amines, esters of α-amino acids and β-amino alcohols afforded optically pure N-t-Boc derivatives in high yields. The reactions were chemoselective and no competitive side reactions such as isocyanate, urea, and N,N-di-t-Boc formation were observed. Chemoselective conversion to N-tert-butylcarbamates took place with amino alcohols without any formation of oxazolidinones.
A red-emitting fluorescent probe based on a benzophospholeP-oxide can ratiometrically visualize the change in Na+concentration in living cells.
基于苯基膦杂环氧化物的红色发光探针可以比色地可视化活细胞中钠离子浓度的变化。
HClO<sub>4</sub>–SiO<sub>2</sub>as a new, highly efficient, inexpensive and reusable catalyst for N-tert-butoxycarbonylation of amines
作者:Asit K. Chakraborti、Sunay V. Chankeshwara
DOI:10.1039/b605074c
日期:——
Perchloric acid adsorbed on silica-gel (HClO4âSiO2) was found to be a new, highly efficient, inexpensive and reusable catalyst for chemoselective N-tert-butoxycarbonylation of amines at room temperature and under solvent-free conditions.