Visible-Light-Induced C–O Bond Formation for the Construction of Five- and Six-Membered Cyclic Ethers and Lactones
作者:Honggu Im、Dahye Kang、Soyeon Choi、Sanghoon Shin、Sungwoo Hong
DOI:10.1021/acs.orglett.8b03166
日期:2018.12.7
Visible-light-induced intramolecular C–O bond formation was developed using 2,4,6-triphenylpyrylium tetrafluoroborate (TPT), which allows the regiocontrolled construction of cyclic ethers and lactones. The reaction is likely to proceed through the single-electron oxidation of the phenyl group, followed by the formation of a benzylic radical, thus preventing a competing 1,5-hydrogen abstraction pathway
Electrochemical C(sp<sup>3</sup>)–H Lactonization of 2-Alkylbenzoic Acids toward Phthalides
作者:Jee Eun Hong、Jisong Yoon、Woohyun Baek、Kyumin Kim、Jae-Hwan Kwak、Yohan Park
DOI:10.1021/acs.orglett.2c04211
日期:2023.1.13
Herein, we report direct electrochemical C(sp3)–H lactonization of 2-alkylbenzoic acids toward phthalides. The reaction provides a wide substrate scope of 2-alkylbenzoic acids bearing primary to tertiary C(sp3)–H bonds by utilizing a graphite anode, dichloromethane (DCM) solvent, hexafluoroisopropanol (HFIP) cosolvent, and n-Bu4NClO4 electrolyte. Our synthetic approach offers a simple, intuitive, and