Change file name via API

Hi. I try to change file name using API, but I can't. 

I tried:

curl -X 'PUT' \
'site/.../1111' \
-H 'accept: */*' \
-H 'Content-Type: application/json' \
-d '{
"name":"test"
}'

And I got: 

    <ref>403</ref>
    <summary>Validation failed/ Forbidden</summary>

If I try "documentname" instead of "name" I got:
    <ref>400</ref>
    <summary>Request resource or xml is not valid</summary>
I will greatly appreciate your help.