PROCESSES FOR PREPARING BENZOFURO [3, 2-C] PYRIDINE- 9-CARBALDEHYDE DERIVATIVES AS NOVEL INTERMEDIATES FOR THE SYNTHESIS OF PDE IV INHIBITORS

摘要

The present invention relates to novel processes for preparing benzofuro [3, 2-c] pyridine- 9-carbaldehyde derivatives, which, are novel and useful intermediates for preparing compounds with PDE4 inhibitory activity, such as 3, 5-dichloro-4- (6- difluoromethoxybenzo [4, 5] furo [3, 2-c] pyridin-9-ylcarboxamido) -1 -pyridiniumolate.