This was brought up back in 2013
Syria may hold uranium stash, Western and Israeli experts say
IRAN CONNECTION?
The former Israeli official said rebels fighting Syrian President Bashar al-Assad, who now control a crescent of suburbs on the outskirts of the capital, may get hold of the stockpile and make its existence public.
“Then it would put paid to the Syrians’ claims that they never had a reactor in the first place,” he said.
Another possibility was that Syria, “knowing the material is no longer secured, could ship it out to Iran, which is certainly in need of more uranium for its own nuclear plans,” the former Israeli official, who declined to be named, added.
But a veteran Israeli intelligence analyst who now works as a government adviser said the figure of 50 metric tons of uranium cited by the Financial Times was “not at all familiar to me”.
https://www.reuters.com/article/us-syria-uranium-israel-idUSBRE90A0MK20130111