The triazolopyridinium ylides (4) are protonated and react with acylium and nitronium ions at the end of the side chain.giving acyl derivatives (8a, 8b) and dinitro derivatives (10a-10c).The structure of the dinitro compound (lob) is confirmed by Xray diffraction.We have reportedl.2that triazolopyridinium ylides (1) are versatile synthons for the production of pyrazolopyridines (212 and for indolizines (3): we also reported3 that ylides (1) where R' = H react with acetylenic esters in a polar solvent to give new ylides of type ( 4) and ( 5) with the addition of one or two acetylene units to the side chain.Ylides of type (4) were previously known, with pyridinium4a or pyrazolium4b ions, but their properties have not been extensively studied.We report here on the reaction between ylides of type (4) and electrophiles.A point of interest lies in the position of substitution.which gives a n indication, in irreversible reactions, of the Ylide ( 1 0 ~1 : 30% yield, mp 2 7 0 -2 7 3 V (ethanol).Anal.Calcd for C17H13N505.0.5CzH60 :
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Abarca et al. (1992) studied this question.