PGP to GPG private key?

I am trying to move from PGP Desktop 9.6 to GPG using winPT, GP10 and GPGee. I have exported my public and secure key from PGP. But when I try and import it in to GPG I can only import the Public Key. I have also tried the command
gpg --allow-secret-key-import --importgpg – key.asc

\gpg --allow-secret-key-import --import key.asc
gpg: key D836F9CD: “Name (PGP)” not chan
gpg: Total number processed: 1
gpg: unchanged: 1

Any ideas what I am doing wrong?