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Synthese von substituierten 2-(Ethoxycarbonyl-formyl-methylen)-2H-benzopyranen und ihre Überführung in Polymethinderivate

✍ Scribed by Tobias Werner; Dieter Greif; Manfred Pulst; Manfred Weissenfels

Publisher
Springer Vienna
Year
1994
Tongue
English
Weight
533 KB
Volume
125
Category
Article
ISSN
0026-9247

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✍ Franz Troxler; Hans Peter Weber 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 German ⚖ 509 KB

The main product of the reaction between 2‐aminobenzimidazole and dimethyl acetylenedicarboxylate is shown to be methyl 1, 2‐dihydro‐2‐oxo‐pyrimido[1, 2‐__a__]benzimidazole‐4‐carboxylate (**6**), which can be methylated at position 1 to give **7**. Catalytic hydrogenation of **7** leads to the 1,2,3