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DOI: 10.1055/s-0029-1217128
Synthesis of 5-Amino-1,10b-dihydro-2H-chromeno[3,4-c]pyridine-2,4(3H)-diones from Coumarins and Cyanoacetamides under Basic Conditions
Publication History
Publication Date:
20 November 2009 (online)
Abstract
The reaction of various coumarins with cyanoacetamide derivatives under basic conditions (sodium ethoxide, piperidine or 2,2,6,6-tetramethylpiperidine), proceeds via an interesting process which involves skeletal rearrangement of the coumarin, a Michael addition and two cyclizations to afford 5-amino-1,10b-dihydro-2H-chromeno[3,4-c]pyridine-2,4(3H)-diones. The same reaction in the presence of N,N¢-ethane-1,2-diylbis(2-cyanoacetamide) gives the corresponding mono and bis 5-amino-1,10b-dihydro-2H-chromeno[3,4-c]pyridine-2,4(3H)-diones.
Key words
coumarins - Michael addition - heterocycles - cyclizations - chromenes
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References
Supplementary crystallographic data for compounds 10a (CCDC 723518) and 14 (CCDC 723519) can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif
21Due to the presence of a stereogenic centre on each of the polycyclic units in 15b, 16b and 17b (C-14b and C-14b′), these compounds exist as diastereoisomeric mixtures. The minor structural differences in these sets of diastereoisomers affects the chemical shifts of several of the carbon atoms. These are listed in the ¹³C NMR spectral data as a double peak with a 0.05-0.10 ppm difference in shift, thereby increasing the number of signals overall.