Compatibility summary
You will need a travel adapter in Syria; plug types used there differ from Singapore.
Plug comparison
Singapore plug types: G
Syria plug types: C E F L
There is no common plug type between Singapore (G) and Syria (C E F L). You need a travel adapter.
Voltage comparison
Singapore: 230V, 50Hz
Syria: 230V, 50Hz
Voltage difference is within a range many devices tolerate; check your appliance label.