Research Article
Catalytic Synthesis of Pyrano- and Furoquinolines Using Nano Silica Chromic Acid at Room Temperature
Table 4
The effectiveness of temperature in the synthesis of pyranoquinolines (Table 1, Entry 4, compounds 4a and 5a) in THF as solvent.
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| Isolated yield. bIsomers were separated by column chromatography. bRatio of the product was determined from the crude 1H NMR spectra. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||