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The reaction of cyano-carbalkoxy-pyridinium-methylids with dimethyl acetylenedicarboxylate

✍ Scribed by C. Leonte; I. Zugrăvescu

Publisher
Elsevier Science
Year
1972
Tongue
French
Weight
226 KB
Volume
13
Category
Article
ISSN
0040-4039

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✦ Synopsis

The heterocyclic nitrogen ylids react as 1.3 dipoles with acetylenic dipolarophilea, leading, via a hypothetic&L dibydroaromatio cycloadduot, to axowatic bicyclic derivatives, as follows (1,2>:

On the other hand, in the case of heterocyclic dioyenomethylids (R P B' = CR), the intenuediary cycloadducrt undergoes either an 1,4 elimination as above (3) or a ring enlargement (4):

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