Effect of ortho-hydroxy substituent on photochemistry of 2-bromo-1-phenylalkan-1-ones: Remote bromine atom shift reaction
作者:Ho Suk Shin、Bong Ser Park
DOI:10.1016/j.tet.2023.133660
日期:2023.10
forms ring-brominated phenyl ketones, where bromine moves from the α-position of the carbonyl to the phenyl ring. The unprecedented remote Br shift reaction occurs with regioselectivity favoring the ortho isomer, which originates from a hypobromite intermediate. The reaction has several advantages over other known methods for the preparation of the ring-brominated 1-(2-hydroxy)phenylalkan-1-ones: no
2-溴-1-(2-羟基)苯基烷-1-酮的辐照形成环溴化苯基酮,其中溴从羰基的α位移动到苯环。前所未有的远程 Br 变换反应发生,区域选择性有利于邻位异构体,该异构体源自次溴酸盐中间体。与其他已知的环溴化1-(2-羟基)苯基烷-1-酮的制备方法相比,该反应具有以下几个优点:无多溴化、邻位选择性、无添加剂、仅使用环保光能,并且在其他活性位点(例如苄基位置)没有溴化。