For chainloading grub2 from grub4dos’ menu.lst file can use uuid or find command.

An example Mint 17 using uuid

title Mint 17
uuid 5abdf54e-b39c-4623-891a-8aef1d00081
kernel /boot/grub/i386-pc/core.img

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An example about finding grub2

title Chainload Grub2
find --set-root /boot/grub/i386-pc/core.img
kernel /boot/grub/i386-pc/core.img
boot

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Notice that older linuxes path is different

kernel /boot/grub/core.img

Read also -> To get Windows boot using Grub4Dos