There are disclosed novel intermediates useful in the preparation of pyrido[2,3-d]pyrimidines having the following structure: ##STR1## wherein R is CH.sub.3, CH.sub.3 CH.sub.2, CH.sub.3 CH.sub.2 CH.sub.2, CH.sub.2 .dbd.CHCH.sub.2 or CH.tbd.CCH.sub.2. The intermediate has the formula: ##STR2## wherein Z is CH.sub.2 OH or CH.sub.2 Br.
公开了一种新的中间体,可用于制备具有以下结构的
吡啶并[2,3-d]
嘧啶:##STR1##其中R为CH.sub.3、CH.sub.3 CH.sub.2、CH.sub.3 CH.sub.2 CH.sub.2、CH.sub.2 .dbd.CHCH.sub.2或CH.tbd.CCH.sub.2。该中间体的
化学式为:##STR2##其中Z为CH.sub.2 OH或CH.sub.2 Br。