Direct Photoexcitation of Benzothiazolines: Acyl Radical Generation and Application to Access Heterocycles
作者:Xiang-Kui He、Juan Lu、Hai-Bing Ye、Lei Li、Jun Xuan
DOI:10.3390/molecules26226843
日期:——
An acyl radical generation and functionalization strategy through direct photoexcitation of benzothiazolines has been developed. The formed acyl radical species can either be trapped by quinoxalin-2-ones to realize their C(3)-H functionalization or trigger a cascade radical cyclization with isonitriles to synthesise biologically important phenanthridines. The synthetic value of this protocol can be
Metal-Free Generation of Acyl Radical via Photoinduced Single-Electron Transfer from Lewis Base to Acyl Chloride
作者:Lei Bao、Zhi-Xiang Wang、Xiang-Yu Chen
DOI:10.1021/acs.orglett.2c03339
日期:2022.11.11
We herein describe a simple approach for generating acyl radical from acyl chloride via photoinduced single-electron transfer. It has been demonstrated that the generated acyl radicals could react with various substrates, including isocyanides, methacrylamides, alkenes, alkynes, and enynes, to afford diverse heterocycles (>10 classes). Mechanistic analyses show that a photoactive charge transfer complex
Photoinduced N-Heterocyclic Nitrenium-Catalyzed Single Electron Reduction of Acyl Fluorides for Phenanthridine Synthesis
作者:Lei Bao、Zhi-Xiang Wang、Xiang-Yu Chen
DOI:10.1021/acs.orglett.3c00049
日期:2023.1.27
Acylfluorides are versatile reagents in organic synthesis. However, there is no precedent to employ acylfluorides as acyl radical precursors. We herein report an N-heterocyclic nitrenium iodide salt-catalyzed photoreduction of acylfluorides to produce acyl radicals, which could react with 2-isocyanobiaryls to afford various carbonyl phenanthridines.