New amino psoralen derivatives have been synthesized via bromination. Bromination of 3,5‐substituted psoralens has been studied. The second position of the furan ring is more susceptible to bromination than the α‐position of the chromen‐2‐one ring in psoralens. Hence, the target psoralenamines were synthesized starting with 3‐bromo‐7‐hydroxy‐4‐methyl‐chromen‐2‐one, which was condensed with different
Transition Metal-Free Cross-Dehydrogenative Coupling Reaction of Coumarins with Acetonitrile or Acetone
作者:Rongxing Zhang、Shengzhou Jin、Qian Liu、Sen Lin、Zhaohua Yan
DOI:10.1021/acs.joc.8b01508
日期:2018.11.2
A transition metal-free cross-dehydrogenativecoupling of coumarins with acetonitrile or acetone has been established. A series of coumarins were subjected to reaction with acetonitrile or acetone in the presence of tert-butyl benzoperoxoate and potassium fluoride for direct synthesis of 3-cyanomethyl (or acetomethyl) coumarins. The method exhibits good functional group tolerance, and desired products
An Efficient and Convenient Synthesis of Furocoumarins via Pechmann Reaction on ZnCl 2 /Al 2 O 3 Under Microwave Irradiation
作者:Abbas Shockravi、Majid M. Heravi、Hassan Valizadeh
DOI:10.1080/10426500307819
日期:2003.1.1
Furocoumarins were rapidly synthesized via Pechmann condensation of 6-hydroxybenzofurans with ethylacetoacetate catalyzed by ZnCl 2 /Al 2 O 3 under solvent-free condition.