Dynamic SQL with OUTPUT syntax help

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SQL

SQL-Server-2012

Hello, i want to code a dynamic SQL query yet syntax errors on my part get in my way. Please help me with the following:

SET @dynamicSQLCommand1 =
    'SELECT @CDT = SELECT TOP 1 DataTime FROM  DestinationDatabase.dbo.' + @CurrentTable + ' ORDER BY DataTime DESC '
    EXEC sp_executesql @dynamicSQLCommand1, N'@CDT nvarchar(500) OUTPUT', @CDT = @CurrentDataTime OUTPUT

I get the error with the SELECT TOP 1 part. Yet i can't really understand the syntax issue.
Thanks for help.