Research Article

Catalytic Synthesis of Pyrano- and Furoquinolines Using Nano Silica Chromic Acid at Room Temperature

Table 2

Synthesis of furoquinolines using nano silica chromic acid (nano-SCA) catalyst in THF as solvent and at room temperature.

EntryProduct 6Product 7Time
(min)
aYield (%) bProduct ratio
6 : 7

1693763.tab.002a693763.tab.002b1008773 : 27

2693763.tab.002c693763.tab.002d959270 : 30

3693763.tab.002e693763.tab.002f899180 : 20

4693763.tab.002g693763.tab.002h12088.575 : 15

Isolated yields. bIsomers were separated by column chromatography. bRatio of the product was determined from the crude 1H NMR spectra.