On the condensation of 2,2-difluoro-4-methyl-benzo[d]-1,3,2-dioxaborines with cyano acetic acid derivatives. Formation and transformation of 3-cyano-4-methyl-benzo[b]pyran-2-ones and their 2-imine precursors |
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| Authors: | H Boutome H Hartmann |
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| Institution: | (1) Department of Chemistry, Martin Luther University Halle, D-06217 Merseburg, Germany;(2) Department of Chemistry, FH Merseburg, D-06217 Merseburg, Germany |
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| Abstract: | Summary By condensation of 2,2-difluoro-4-methyl-benzod]-1,3,2-2H-dioxaborines (12) with cyano acetic acid derivatives in presence of weak bases, 3-cyano-4-methyl-benzob]pyran-2-ones (13) or their 3-cyano-4-methyl-benzob]pyran-2-imine precursors (14) are available in satisfactory yields.
Zur Kondensation von 2,2-Difluor-4-methyl-benzod]-1,3,2-2H-dioxaborinen mit Cyanessigsäure- Derivaten. Bildung und Umwandlung von 3-Cyano-4-methyl-benzob]pyran-2-onen und ihrer 2-Imino-Vorstufen Zusammenfassung Durch Kondensation von 2,2-Difluor-4-methyl-benzod]-1,3,2-2H-dioxaborinen (12) mit Cyanessigsäure-Derivaten in Gegenwart von Hilfsbasen entstehen in befriedigenden Ausbeuten 3-Cyan-4-methyl-benzob]pyran-2-one (13) oder ihre 3-Cyan-4-methyl-benzob]pyran-2-imino-Vorstufen (14). |
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| Keywords: | 3-Cyano-4-methyl-benzo[b]pyran-2-ones 3-Cyano-4-methyl-benzo[b]pyran-2-imines Knoevenagel condensation of 2 2-difluoro-4-methyl-benzo[d]-1 3 2-2H-dioxaborines |
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