What happens when you try? Not 100% sure but from
http://msdn.microsoft.com/en-us/library/bb510680.aspx my understanding is that you can't (ie SQL Server 2014 can restore SQL Server 2008 or later databases ?). So you'll likely have to use SQL Server 2008 or SQL Server 2008 R2 Express Edition
to do an intermediate restore/backup (and likely the compat level needs to be changed between the restore and the backup).
As this is quite specialized a SQL Server forum at the
http://msdn.microsoft.com site might be better for this particular question.