Certain 4-substituted-2,6-bis(heteroaryl)pyridines
AssigneeThe Hilton-Davis Chemical Co.
InventorsPaul J. Schmidt, William M. Hung
Life of this patent
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Abstract
Novel 4-[4-(substituted-amino)phenyl]- or heteroaryl-2,6-bis(heteroaryl)pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a heteroaryl methyl ketone with a 2-R.sub.4 -4-NR.sub.5 R.sub.6 -benzaldehyde or a heteroaryl aldehyde in the presence of ammonia or an ammonia-releasing agent.
Claims12
A compound having the formula ##STR12## wherein:
- Ar is a substituent having the formula ##STR13## in which:
- R.sub.1 is hydrogen or non-tertiary lower-alkyl;
- X is O or S;
- Z is a substituent having the formula ##STR14## in which:
- R.sub.4 is hydrogen, lower-alkyl, halo, lower-alkoxy, lower-alkoxycarbonyl or di-lower-alkylamino;
- R.sub.5 is lower-alkyl, and
- R.sub.6 is lower-alkyl, benzyl, cyano-lower-alkyl, or
- NR.sub.5 R.sub.6 is pyrrolidinyl, piperidinyl, morpholinyl or isoindolinyl.
A compound according to claim 3 wherein:
- R.sub.5 is lower-alkyl and
- R.sub.6 is lower-alkyl or benzyl.
A compound according to claim 5 wherein NR.sub.5 R.sub.6 is pyrrolidinyl, piperidinyl, morpholinyl or isoindolinyl.
A compound according to claim 6 wherein X is S.
A compound according to claim 8 wherein X is S.
4-[4-(Dimethylamino)phenyl]-2,6-bis(2-thienyl)pyridine according to claim 9.
Dependencies are inferred from the claim text.