A novel one‐step synthesis of 4H‐furo[3,4‐b]pyrans and a transformation into a difuro[3,4‐b: 3′,4′‐e]pyridine

1. Martín, N.
2. Segura, J.L.
3. Seoane, C.
4. Soto, J.L.
5. Morales, M.
6. Suarez, M.