✍ Scribed by A. Paul Krapcho; Sergio A. Cadamuro
No coin nor oath required. For personal study only.
Reactions of pyridine‐2‐carboxaldehyde (9) with α,α′‐dibromo‐o‐ and p‐xylenes led to the corresponding bis‐pyridinium aldehydes 10 and 14. These aldehydes were quite reactive and the respective hydrates 11 and 15 were also formed. Cyclization of 10 or 11 with 48% HBr led to 12 while cyclization with PPA followed by conversion to the bis tribromide and loss of bromine led to 1. Cyclization of 14 or 15 with 48% HBr led to 3. Attempts to react α,α′‐dibromo‐m‐xylene with pyridine‐2‐carboxaldehyde (9) were not successful for the preparation of the bis‐pyridinium aldehyde 13. The bis‐pyridinium acetals 4, 5 and 6 were prepared and cyclized to afford 1, 2 and 3, respectively, by the previously reported procedures. The structures of 1 and 2 were verified by ^1^H‐NMR and ^13^C‐NMR spectroscopy while that of 3 was confirmed by X‐ray analysis.
📜 SIMILAR VOLUMES
A series of guanylhydrazones derived from 2- and 4-pyridine and 4-quinoline carboxyaldehydes was synthesized from S-methylisothio-semicarbazide hydroiodide using known procedures. The compounds are analogous to anticancer and antiviral thiosemicarbazones, but several of the guanylhydrazones derived
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