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2842594577
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note
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When the enamine 2 is heated under reflux in benzene, the anticippated ethyl (1-methoxycarbonyl-4-oxo-4H-pyrido[1,2-a]pyrazin-3-yl)acetate is formed in only 25% yield [2].
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23
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2842541282
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24
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2842526866
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note
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13C nmr spectra could not be recorded because of the insolubility of this compound in common nmr solvents.
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-
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25
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2842527968
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note
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Only the chemical shifts for the predominanting geometrical isomer are given.
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