iodine)-induced intramolecular 7-endo-dig cyclization of 1-([1,1′-biphenyl]-2-yl)alkynones is reported. Detailed investigations on the substituenteffectsduring the electrophilic iodocyclization of the alkynones show that they play a crucial role in determining the reaction pathways of the cyclization. By modifying the substitution pattern on the alkynone substrates, the cyclization takes place regioselectively
Synthesis of Seleno-Dibenzocycloheptenones/Spiro[5.5]Trienones by Radical Cyclization of Biaryl Ynones
作者:Helen A. Goulart、Ricardo H. Bartz、Thiago J. Peglow、Angelita M. Barcellos、Rodrigo Cervo、Roberta Cargnelutti、Raquel G. Jacob、Eder J. Lenardão、Gelson Perin
DOI:10.1021/acs.joc.1c03112
日期:2022.3.18
We report herein an alternative method for the synthesis of seleno-dibenzocycloheptenones and seleno-spiro[5.5]trienones through the radical cyclization of biaryl ynones in the presence of diorganyl diselenides, using Oxone as a green oxidizing agent. The reactions were conducted using acetonitrile as the solvent in a sealed tube at 100 °C. The protocol is operationally simple and scalable, exhibits