Journal
SYNTHESIS-STUTTGART
Volume 44, Issue 23, Pages 3598-3602Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0032-1317527
Keywords
Roflumiast; PDE4 inhibitor; preparation; hydroxylation; copper catalyzed
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A new route to Roflumilast, a selective phosphodiesterase type 4 (PDE 4) inhibitor, is described. The synthetic procedure starts from 4-hydroxy-3-iodobenzoic acid to access the key intermediate 3-(cyclopropylmethoxy)-4-(difluoromethoxy) benzoic acid via copper-catalyzed hydroxylation and utilizes amide coupling to accomplish the synthesis of Roflumilast in 80% overall yield.
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