Synthesis of 6-Bromocoumarins Using Tetrabutylammonium Tribromide as a Selective Brominating Agent and an Efficient Generator of HBr
作者:Li-Qiang Wu、Chun-Guang Yang、Yan-Fang Wu、Li-Min Yang
DOI:10.1002/jccs.200900090
日期:2009.6
A simple and efficient one‐pot synthesis of 6‐bromocoumarins was achieved in good yields via the three‐component reaction of phenols, 4‐substituted acetoacetate and tetrabutylammoniumtribromide (TBATB) in CH2Cl2‐MeOH.
Synthesis and photochemical properties of new photoremovable protecting groups for nucleobases are described. Four caged 2'-deoxycytidines (dCs) were synthesized, and their photochemical properties were measured under simulated physiological conditions. Two new coumarin-caged dCs show better photochemical and photophysical properties than those of the caged dCs having previously reported caging groups.