Use of a alias in one subquery

Executing the command below it returns an error informing that "A1" is an invalid identification.
select 1 as a1, (select a1 as b2 from dual) as b1 from dual
Is not possible to create one alias and to use it in one subquery in the same command?
It exists another form of if getting this result?

I placed ' the changeable ' term for you understand what I really need. I go to more clearly try to be.
I attribute to value 1 to variavel a1, and in subquery I attribute to the variable a1 to the second variable b2. And the result of this is attributed to the third variable b2.
In the first column of mine ' select ', I create column I unite a1 to receive value 1, in the second column of mine ' select ', I make one subquery selecting column I unite a1 (first column of select) and I create as column you unite to receive the value from column you unite a1. This select must return the content from column unites a1=1 and b1=b2=a1=1.
My problem is of this type, only that in a context of my application.
If I to decide this basic example, I will also decide the problem of my application.
You can make tests with as select that I passed (select 1 aa, 2 bb, (aa + bb) the dual c from).
In this in case that, I create column you unite aa to receive value 1, I create column you unite bb to receive value 2, I add the content of the two column you unite and I create column you unite c to receive the addition, that is equal (1+2)=3.

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