Functionalized free radical addition/cyclization reactions represent an efficient way for introducing new functionality or coupling fragments to molecules. Ynones are good regional selectivity radical acceptors in organic synthesis, and many of bio-relevant cyclic compounds could be easily obtained by direct radical cyclization reaction. Here, we report a photocatalytic cascade radical addition of
Mn(III)-promoted synthesis of spiroannular tricyclic scaffolds via sulfonylation/dearomatization of biaryl ynones
作者:Li Zhou、Yu Xia、Yu-Zhao Wang、Jun-Dan Fang、Xue-Yuan Liu
DOI:10.1016/j.tet.2019.01.041
日期:2019.3
A Mn(III)-promoted radical oxidative ipso-annulation reaction of biaryl ynones with sodium sulfinates to construct various substituted spiro[5.5]trienones has been explored in this study. This protocol is characterized by mild reaction conditions, good substrates functional group compatibility, cheap and easily prepared Mn(OAc)(3)center dot 2H(2)O, and it demonstrates a simple operation. (C) 2019 Elsevier Ltd. All rights reserved.
Visible Light Promoted Brominative Dearomatization of Biaryl Ynones to Spirocycles