Iodine/Water-Mediated Oxidation of<i>o</i>-Alkynylaroyl Compounds and Application of the Products of Oxidation in the Synthesis of Nitrogen Heterocycles
作者:Karuppusamy Sakthivel、Kannupal Srinivasan
DOI:10.1002/ejoc.201300046
日期:2013.6
facile iodine/water-mediated oxidation of the triple bond of o-alkynylaroyl compounds to furnish tricarbonyl compounds is reported. The reaction proceeds through the formation of isochromenol intermediates by the assistance of the neighbouring aroyl group. The product tricarbonyl compounds are versatile synthetic precursors that, upon treatment with mono- and diamines, hydrazines and amino alcohols, afford
Photoswitchable Oxidopyrylium Ylide for Photoclick Reaction with High Spatiotemporal Precision: A Dynamic Switching Strategy to Compensate for Molecular Diffusion
3-diaryl indenone epoxide (DIO) and mesoionic oxidopyryliumylide (PY) is governed by dual-λ gating, in which PY can undergo fast [5+2] cycloaddition with BCN. A photoswitchablestrategy for photoclick labeling with spatiotemporal control was developed, recycling the unreacted PY to minimize side-effects. Also, moleculardiffusion of the reactive PY was compensated for by improvement of the spatial accuracy