Bitcoin Core Problem
As far as I know, you heard wrong.  I don't think Bitcoin Core supports sending coins when the wallet is not synchronized.  It needs an up-to-date copy of all the transactions on the network, so that it can be sure of spending coins that have not already been spent.  (Such a transaction would be rejected by the network, but it would lead to confusion on your end, and could also result in other nodes on the network refusing to relay your other legitimate transactions.)

You can either wait to synchronize (note that you are downloading about 60 GB of data) or see Cannot access my bitcoins because my wallet is still synchronising. What can I do to spend them immediately?