With Nmap it is possible to scan according mac address?

Keep in mind that nmap is an IP based scanner. Based on the information that you have provided, I would suggest using nmap to perform a host discovery i.e. identifying active hosts in a network. This step will give you a list of active IP addresses.

You can use ARP to resolve the IP addresses (Obtained during host discovery) to MAC addresses (Assuming its all in the same local area network). Once you have identified the MAC addresses that you wish to scan, feed the corresponding IP addresses to nmap for scanning.

In short:

Host Discovery > IP to MAC conversion > Identify target IP addresses using MAC > Port scanning

Refer this for more information on using nmap.

This is a one-liner to find the IP of a Synology NAS by MAC address in the local network:

nmap -sP 192.168.1.0/24 | grep -B 2 "00:11:32:XX:XX:XX" | head -n 1 | cut -d " " -f 5

grep, head and cut trim the text to get the desired IP.