Alum [KAl(SO4)2·12H2O]: a green and efficient catalyst for synthesis of pyrano[4,3-b]pyrans in water under conventional and microwave conditions
作者:Deepika Rajguru、Balwant S. Keshwal、Shubha Jain、Vasant W. Bhagwat
DOI:10.1007/s00706-013-0975-x
日期:2013.9
One-pot synthesis of pyrano[4,3-b]pyrans by condensation of 4-hydroxy-6-methylpyran-2-one, aromatic aldehydes, and malononitrile or cyanoacetates in water using alum as a non-toxic, readily available, and reusable catalyst at 80 A degrees C under conventional conditions and also under microwave irradiation is described.