| 摘要 |
There are disclosed novel intermediates useful in the preparation of pyrido[2,3-d]pyrimidines having the following structures: <IMAGE> I wherein R is CH3, CH3CH2, CH3CH2CH2, CH2=CHCH2 or CH 3BOND CCH2; and <IMAGE> II wherein R is CH3, CH3CH2, CH3CH2CH2, CH2=CHCH2 or CH 3BOND CCH2. These intermediates have the formulas: <IMAGE> III <IMAGE> IIIA and <IMAGE> IIIB wherein Y is CHO, CH2OH or CH2Br; and Z is CH2OH or CH2Br.
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