The invention belongs to the technical field of medicines and particularly relates to a
phosphodiesterase-4 inhibitor as shown in a general formula (I) and a pharmaceutically acceptable salt, a stereoisomer or a
solvent compound thereof. In the formula, R1, R2, R3, R4, R5, R6, R7, R8, R9, R7', R8', R9', L and a ring A are as defined in the specification. The invention further relates to a preparation method for the compound, a pharmaceutical composition with the compound, and an application of the compound and the pharmaceutical composition to preparation of drugs for treating and / or preventing inflammatory diseases,
disease symptoms and
disease conditions characterized by or related with undesired inflammatory
immune reaction and all diseases induced by or related with TNF-alpha (
tumor necrosis factor-alpha) and PDE-4 (
phosphodiesterase-4) hypersecretion.