since coinbase is completly broken I downloaded Armory and send some btc to it.
My Armory is not synced yet, and it says, it takes ~ 1 day. Is there any way I still can send the btc to an other address? Can I get the private key maybe somehow to use it in an other wallet, where I dont have to download 50 (?) GB first?
Thank you very much guys!
Top tip for using Armory, make sure it's synced up with the network before sending any bitcoins to your wallet.
If you have some bitcoin looked behind an unsynced instance of Armory, see if you have any friends with a synced Armory instance. You can send them a watching-only copy of your wallet, and have them create a transaction for you to extract your funds to a new address that you know you can spend from. Your friend will can create a transaction to an address that you specify, then send the unsigned transaction back to you, to verify and sign with your offline instance of Armory. This activity only risks your privacy. Just make sure you really verify that the output of the transaction that your friend sends back to you is what you are expecting.