Aroyl Fluorides as Bifunctional Reagents for Dearomatizing Fluoroaroylation of Benzofurans
作者:Xiaoye Yu、Qing-Yuan Meng、Constantin G. Daniliuc、Armido Studer
DOI:10.1021/jacs.2c01735
日期:2022.4.27
diastereoselectivity. Cascades proceed via radical/radical cross-coupling of a benzofuran radical cation generated in the photoredox catalysis cycle with a neutral ketyl radical formed through the NHC catalysis cycle. The redox-neutral transformation exhibits broad substrate scope and high functional group compatibility. With anhydrides as bifunctional reagents, dearomatizing aroyloxyacylation of benzofurans is
2,3-二氢苯并呋喃支架广泛存在于天然产物和生物活性化合物中。在此,报道了用芳酰氟作为双官能试剂对苯并呋喃进行2,3-氟芳酰化,得到2,3-双官能化的二氢苯并呋喃。通过协同 NHC/光氧化还原催化发生的反应提供了 3-芳酰基-2-氟-2,3-二氢苯并呋喃,具有中等至良好的产率和高非对映选择性。级联通过光氧化还原催化循环中产生的苯并呋喃自由基阳离子与 NHC 催化循环中形成的中性羰基自由基的自由基/自由基交叉偶联来进行。氧化还原中性转化表现出广泛的底物范围和高官能团兼容性。以酸酐作为双功能试剂,实现了苯并呋喃的脱芳构化芳酰氧基酰化,该策略也可以应用于N-酰化吲哚,得到3-芳酰基-2-氟-二氢吲哚。