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Synthesis 1986; 1986(2): 147-150
DOI: 10.1055/s-1986-31504
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Eine einfache Synthese von 5H-[1]Benzopyrano[4,3-d]pyrimidin-Derivaten mit Oxo-, Thioxo- und/oder Imino-Funktionen in 4- und 5-Stellung

Detlef Briel* , Siegfried Leistner, Günther Wagner
  • *Sektion Biowissenschaften, Karl-Marx-Universität Leipzig, Bereich Chemie biologisch aktiver Verbindungen, DDR-7010 Leipzig, Deutsche Demokratische Republik
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Publication Date:
20 August 2002 (online)

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A Simple Synthesis of 5H-[1]Benzopyrano[4,3-d]pyrimidine Derivatives having Oxo-, Thioxo-, and/or Imino Functions at Positions 4 and 5 The reaction of 4-dicyanomethylene- or 4[cyano-(ethoxycarbonyl)-methylene]-2-(2-hydroxyphenyl)-4H-1, 3-benzoxazine with ammonium acetate, hydrogen sulfide, or aqueous acid represents a useful method for the preparation of 4,5-(imino, thioxo, or oxo)-disubstituted 2-(2-hydroxyphenyl)-3,4-dihydro-5H-[1]benzopyrano[4, 3-d]pyrimidines.

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