You can set a spectific style for Chapter 1 that you won't refer into your TOC.
More info can be found here : http://sbarnhill.mvps.org/WordFAQs/TOCTips.htm#Content
[EDIT] More explanation about including style :
What i meant is explained here : http://support.microsoft.com/kb/285059/en-us on the Removing a Heading from the Table of Contents part. That is to say, you will set a current style for Chapter 1 (say "Heading unTOC" that you would have created elsewhere) and another style for Introduction (say "Heading 1").
Then, when you create your TOC, you can choose which style you want to include (by default, Word will include only numeroted styles : Heading 1, Heading 2, and so on).
This way, only Introduction will be added to the TOC and Chapter 1 won't.
Besides, i can see it does not fully answer what you asked because you wanted to keep also the 1. For this part, i can't see an easy way to do it.