Irradiation of azido carbonyl compounds using UV light (>= 310 nm) produced triplet alkyl nitrenes and aroyl radicals, which resulted in efficient cleavage of single strand DNA at pH 7.0. DNA cleaving ability of azido carbonyl compounds was found to be dependent on its concentration and substituents on its aromatic ring. Further, newly synthesized naphthalene based azido carbonyl compounds showed DNA cleavage ability at longer wavelength of UV light (>= 350 nm) and also binding studies revealed that they bind to ct-DNA by weak intercalation mode. (C) 2012 Elsevier B.V. All rights reserved.
Visible Light Copper Photoredox-Catalyzed Aerobic Oxidative Coupling of Phenols and Terminal Alkynes: Regioselective Synthesis of Functionalized Ketones via C≡C Triple Bond Cleavage
Direct oxidative coupling of phenols and terminal alkynes was achieved at room temperature by a visible-light-mediated copper-catalyzed photoredox process. This method allows regioselective synthesis of hydroxyl-functionalized aryl and alkyl ketones from simple phenols and phenylacetylene via C≡C triple bond cleavage. 47 examples were presented. From a synthetic perspective, this protocol offers an
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