Regioselective synthesis of benzo[c]chromen-6-ones by one-pot cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 4-chloro-2-oxo-2H-chromene-3-carbaldehyde
β Scribed by Olumide Fatunsin; Viktor O. Iaroshenko; Sergii Dudkin; Satenik Mkrtchyan; Alexander Villinger; Peter Langer
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- French
- Weight
- 326 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
a b s t r a c t
The cyclocondensation of 4-chloro-2-oxo-2H-chromene-3-carbaldehyde with 1,3-bis(silyloxy)-1,3-butadienes provides a convenient synthesis of benzo[c]chromen-6-ones.
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2-(Arylamino)-4-oxo-4H-chromene-3-carbaldehyde 3 (R 2 = aryl) produces 12H-chromeno[2,3-b]quinolin-12-one 4 when treated with sarcosine, piperidine or diethylamine, but produces 3,3 0 -methylenebis(2-arylamino-4H-chromen-4-one) 8 when treated with the same amine in the presence of an excess of forma