| 摘要 |
3 - carbethoxy - 4 - oxo - 1,4a - diazanaphthalenes of formula <FORM:0994343/C2/1> wherein R1 is hydrogen, R3 to R6 are hydrogen, alkyl, or halogen and R2 is carbethoxy are prepared by refluxing 2-aminopyridine or its appropriate substitution product with diethyl ethoxymethylene malonate. Specified compounds are wherein the R's are chlorine, idoine bromine and methyl. 4 - thio - 4a - azanaphthalene is prepared by refluxing 4 - oxo - 4a - azanaphthalene with phosphorus pentasulphide and adding ammonium sulphide. 2,5 - bis (carbethoxy) - 3 - methyl - 4 - oxo - 1 - thia - 3a,7 - diazaindene is prepared by refluxing 2 - amino - 4 - methyl - 5 - carbethoxythiazole with diethyl ethoxymethylenemalonate. Specifications 843,541, 843,542 and 974,837 are referred to.
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