1.
First find→ the correct name without the substituents:
Furo[3,2-b]pyridine
2.
Start numbering at an atom adjacent to a junction atom, possibilities:
3.
Continue the numbering by moving away from the junction atom. Keep the possibility that the priority heteroatom ( here O ) has the lowest index. Design the carbon atoms of the junctions by the preceding index followed by the letter a:
4.
Use this last numbering as well as the correct name without substituents to build the final name: 2,6-Dimethylfuro[3,2-b]pyridine
Benzo[d][1,3]diazin-7-ol
1H-4-Bromobenzo[d][1,2]thiazin-8-carbaldehyde
6H-2-Trichloromethylpyrimido[4,5-f][1,3,5]dioxazocine
Benz[b]azocinyl-5-methyl-2propanoïc acid