Due to special properties of ILs (ionic liquids) like their wide liquid range,
good solvating ability, negligible vapour pressure, non-inflammability, environmentfriendly
medium, high thermal stability, easy recycling and rate promoters etc. they are
used in organic synthesis. Therefore, ionic liquids have attracted the attention of chemists
and act as a catalyst and reaction medium in organic reaction with high activity. There is
no doubt that ionic liquids have become a major subject of study for modern chemistry.
More publications in the field have been observed each year, although there is some evidence
that this is beginning to plateau at approximately 3500 papers each year. They have
been the subject of several major reviews and books, dealing with different applications
and aspects of their behavior. Highly efficient methods are explored for the preparation of
six-membered two nitrogen-containing heterocycles with the application of IL as a catalyst and reaction medium
from 1893 to 2018.
Keywords: Ionic liquid, heterocycles, nitrogen-containing heterocycles, aza heterocycles, pyrimidine, quinazoline, quinoxaline.
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