Synthesis of pyrano[2,3-f]chromen-2,8-diones and pyrano[3,2-g]chromen-2,8- diones based on o-hydroxyformyl(acyl)neoflavonoids
Novel pyrano[2,3-f]chromen-2,8-diones and pyrano[3,2-g]chromen-2,8-diones were prepared based on modified analogs of natural o-hydroxyformyl(acyl) neoflavonoids.
Moskvina,Khilya
p. 16 - 23
(2008/09/18)
An efficient ZrCl4 catalyzed one-pot solvent free protocol for the synthesis of 4-substituted coumarins
A versatile and efficient route to 4-substituted coumarins via a Pechmann reaction using ZrCl4 as the catalyst (10 mol %) is described. This method provides several advantages over alternative procedures such as mild, solvent-free conditions at ambient temperature, and direct isolation of the products in high yields.
Sharma,Janardhan Reddy,Sree Lakshmi,Radha Krishna
p. 6119 - 6121
(2007/10/03)
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