## Abstract The title compounds 5aβc and 7aβm have been prepared by Vilsmeier formylation of 4βaminocoumarins 1 yielding aldehydes 2, and subsequent condensation of 2 with CβH acids in the presence of piperidine. This condensation probably proceeds via the intermediate ylidenemalonic esters 4. By m
β¦ LIBER β¦
Synthesis of 5H-[1]benzopyrano[4,3-b]pyridin-5-ones containing an azacannabinoidal structure
β Scribed by D. Heber; Th. Berghaus
- Book ID
- 112131045
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1994
- Tongue
- English
- Weight
- 468 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0022-152X
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## Abstract The highly reactive 1β:β1 intermediate generated in the reaction between dialkyl acetylenedicarboxylate (=butβ2βynedioic acid dialkyl ester) **4** and triphenylphosphine was trapped by 2βaminoβ4βoxoβ4__H__β1βbenzopyranβ3βcarboxaldehydes **5** to yield highly functionalized dialkylβ1,5βd