Ethanol → Milrinone

Beteiligte Stoffe

Reaktionsschritte

Another aspect of the invention resides in the second step of the above process, that is, the reaction of said ketone of formula II with malononitrile in a lower-alkanol to produce 1,2-dihydro-6-R-2-oxo-5-PY-nicotinonitrile of formula III. In a preferred embodiment of this aspect, 2-ethoxy(or methoxy)-1-(4- or 3-pyridinyl)ethenyl methyl(or ethyl) ketone is reacted with malononitrile in ethanol to produce 1,2-dihydro-6-methyl(or ethyl)-5-[4(or 3)-pyridinyl]nicotinonitrile. In a particularly preferred embodiment, 2-ethoxy-1-(4-pyridinyl)ethenyl methyl ketone is refluxed with malononitrile in ethanol to produce 1,2-dihydro-6-methyl-2-oxo-5-(4-pyridinyl)nicotinonitrile.

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