摘要 |
<p>Triazolopyridines of formula (I) and triazolopyridinium salts of formula (Ia) are new In the formulae, R1-4 are H, halogen, opt. substd. alkyl, aryl or aralkyl, NO2 or CN, R5 is a C-bonded quaternised N-contg. heterocyclic gp. X is 1 equiv. of an anion, R7 is opt. substd. alkyl or a C-bonded opt. substd. and opt. satd. heterocyclic gp. (quaternised if N-contg.), R6 is alkyl or, when R7 is a heterocyclic gp. contg. a quaternised N atom ortho to the bonding posn. R6 can form a CH2, CH2CH2, CH2CH2CH2 or CH=CR gp. bonded to the quaternised N atom, R is alkyl. A typical cpd. is 1-methyl-2-(1-methylpyridinium-4-yl) -s-triazolo(1,5-a pyridinium bis(methyl sulphate). In an example, this is prepd. from 1-aminopyridinium chloride and 4-cyanopyridine.</p> |