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I duplicated Building_Door and added:

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<researchPrerequisites>
      <li>Architecture</li>
    </researchPrerequisites>

... at the bottom.

Then I made a new research project called "Architecture":

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<?xml version="1.0" encoding="utf-8" ?>
<Defs>

<ResearchProjectDef>
    <defName>Architecture</defName>
    <label>Architecture</label>
    <description>Build walls, doors and roofs to keep your people safe from the elements</description>
    <baseCost>600</baseCost>
    <techLevel>Neolithic</techLevel>
  </ResearchProjectDef>
 
</Defs>

I started a new tribal colony in the hope that this would prevent me from building doors until the architecture research was complete, however, doors are available from the beginning. I can see that the research project exists in the research menu successfully. Is there more to prerequisites than this or are doors a special case?