How can I sync CouchBase with RDBMS?

Hi All,
We have interrelated applications with two behaviours, one is web application ( admin users ) and another one is mobile application ( normal users ), whereas we took the decission to use couchBase as repository for mobile application and mysql as repository to web application. Can you please let me know, how can both will sync together ( If we enter something in couchbase, the same should be available with mysql and if we remove something from mysql, relevant document should be removed from couchBase ).