designed and synthesized to gain insight into the oxa‐6π electrocyclicreaction of cis,cis‐1,8‐dioxatetraene for the first time. The stability of the 1,8‐dioxatetraene intermediate is governed by its steric congestion and can be fine‐tuned through modification of the backbone structure, leading to the reactivity differences in the 6π electrocyclicreaction and the emergence of photochromic properties.
Copper-Assisted Synthesis of 2-Hydroxyphenyl-1,2-diones from Phenols and 2-Oxoaldehydes
作者:Narsaiah Battini、Satyanarayana Battula、Qazi Naveed Ahmed
DOI:10.1002/ejoc.201501423
日期:2016.2
An efficient copper(II)‐catalyzed protocol for the ortho‐functionalization of phenols is developed. This method tolerates a wide variety of 2‐oxoaldehydes and phenols and affords the corresponding 2‐hydroxyphenyl‐1,2‐diones in appreciable yields.