A facile and efficient synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[4,3-b]pyrans derivatives using phosphate fertilizers MAP, DAP, and TSP as heterogeneous catalysts

Soukaina Chehab, Youssef Merroun, Tourya Ghailane, Rachida Ghaılane, Saı̈d Boukhris, B. Lakhrissi, Abdelaziz Souızı