For the preparation of the aminoxanthotoxol (Ic) imperatorin (Ia) is treated with 70% HNO3 (the procedure has been described earlier) to give (Ib) which is reduced with Sn/HCl.
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ChemInform Abstract: Synthesis of Some New 5‐Arylimine and 5‐Pyridimine‐8‐hydroxy and 8‐Methoxypsoralenes