underwent co‐trimerization with carboxylic acids in the presence of ZnBr2 to smoothly provide oxazoles (see scheme). The reaction is thought to occur by initial nucleophilic addition of the carboxylic acid to a ligated isonitrile molecule, followed by a sequence involving double migratory insertion, metal‐salt elimination, acyl migration, cyclization, and dealkylation.
I<sub>2</sub>/TBHP-Mediated Oxidative Coupling of Amino-Based Bisnucleophiles and Isocyanides: Access to 2-Aminobenzoxazinones, 2-Aminobenzoxazines, and 2-Aminoquinazolines under Metal-Free Conditions
作者:Hong-Xia Wang、Tian-Qi Wei、Pei Xu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b02395
日期:2018.11.2
An I2/tert-butyl hydroperoxide (TBHP)-mediated oxidative coupling reaction of isocyanides with amino-based bisnucleophiles is described for the synthesis of 2-aminobenzoxazinones, 2-aminobenzoxazines, and 2-aminoquinozolines in moderate to excellent yields. Furthermore, this method provides a simple and practical method to construct potential functionalized biologically active molecules.
Five-membered boron difluoro complexes using a secondary amide as an anionic ligand display large Stokes shift and significant solid-state emission. Dyes exhibiting room- temperature phosphorescence (RTP) emission in both amorphous and crystalline states are documented.