Radical-mediated photoredox hydroarylation with thiosulfonate
作者:Xiaoyuan Wan、Dahan Wang、Huawen Huang、Guo-Jiang Mao、Guo-Jun Deng
DOI:10.1039/d2cc05948g
日期:——
Herein, we report a novel visible light-induced photocatalytic system that enables intramolecular hydroarylation of unactivatedalkenes. Thiosulfonate compounds were found to be the key radical precursor that mediates the Minisci-type intramolecularcyclization reaction. Under the optimal reaction conditions, a wide range of pyridyquinazolinone and pyrroloquinazolinone products were obtained in moderate
Metal-Free Photoinduced Hydrocyclization of Unactivated Alkenes toward Ring-Fused Quinazolin-4(3<i>H</i>)-ones via Intermolecular Hydrogen Atom Transfer
作者:Zixian Yang、Xian Wu、Jie Zhang、Jin-Tao Yu、Changduo Pan
DOI:10.1021/acs.orglett.3c00329
日期:2023.3.17
of unactivated alkenes was developed using 3CzClIPN as the photocatalyst to generate substituted α-methyldeoxyvasicinones and α-methylmackinazolinones in moderate to good yields. An intermolecular hydrogen atom transfer with THF as the hydrogen source was involved. Mechanism studies indicated that the intramolecular addition of the in situ formed aminal radical to the unactivated alkene generated the
Photocatalytic alkenes to ring-fused quinazolin-4(3H)-ones via proton-transfer shuttle using TFA
作者:Xianming Wang、Xinhan Li、Luqian Zou、Qinli Lu、Chenggang Zao、Qingling Ou、Ruifeng Fan、Jianbin Xu、Baomin Fan
DOI:10.1016/j.tet.2024.133990
日期:2024.5
system is reported that enables intramolecularhydroarylation of unactivatedalkenesvia a proton transfer shuttle using TFA, providing a concise access to the formation of pyrroloquinazolinone and pyridyquinazolinone products in moderate to good yields. Mechanistic studies revealed that the protonated quinazolinone is the key radical precursor mediating the intramolecular cyclization reaction.
A newly designed radical cascade involving N-acyl cyanamides is reported. It builds on aromatic homolytic substitutions as intermediate events and leads to complex heteroaromatic structures via an unprecedented radical migration of a substituent on aryl groups of quinazolinones (hydrogen or alkyl). Mechanistic considerations are detailed, which allowed us to devise fine control over the domino processes