The invention provides a new synthetic
route for preparation of
ciclesonide. The method comprises the steps that used raw materials are cheaper and available, the reaction raw materials are protectedafter
hydroxylation, selective oxidation of a five-membered ring
double bond is then performed, then, a six-membered ring
double bond bromination is conducted,
bromine atom is removed by reduction, acarbonyl group and a hydroxyl
protecting group are removed, then, an oxidized dihydroxyl group is protected, the six-membered ring
double bond is then epoxidized and reacts with cyclohexanecarboxaldehyde and isobutyryl
chloride in turn to obtain a
ciclesonide product. A reaction process is easy to operate, yield is higher in each step, purity of the obtained product is also higher, generation of by-products is effectively avoided, production cost is reduced, and the new synthetic
route for the preparation of the
ciclesonide is advantageous to industrial production.