Pyridines and Quinolines from 1,3-Dichloro-Trimethinecyanines Pyrimidine and Quinazoline from Azacyanine
A new synthesis of 2,4-bis(dialkylamino)-pyridines and quinolines is reported. Starting from primary aryl amines or aliphatic imines a mechanism via ynamine-amidines is followed if the cyanine Ia is used as reagent. When the cyanine is substituted, (I.R. ≠ H) it reacts well in high dilution conditi...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Swiss Chemical Society
1976-03-01
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| Series: | CHIMIA |
| Online Access: | https://www.chimia.ch/chimia/article/view/9298 |
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| Summary: | A new synthesis of 2,4-bis(dialkylamino)-pyridines and quinolines is reported. Starting from primary aryl amines or aliphatic imines a mechanism via ynamine-amidines is followed if the cyanine Ia is used as reagent. When the cyanine is substituted, (I.R. ≠ H) it reacts well in high dilution conditions via the alternate intermediates XI and XII. In the same manner, the azacyanine XV forms the pyrimidine XVII and the quinazoline XVI.
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| ISSN: | 0009-4293 2673-2424 |