Diastereospecific fluorination of substituted azepanes

Fluorination of bioactive compounds is an important step in drug discovery and development. Fluorination has been extensively studied in acyclic systems, carbocycles, and fused heterocycles. However, there is no report on fluorination of azepanes. As azepanes are components of many biologically active substances and natural products. We herein present the first fluorination examples of substituted azepanes. Fluoroazepanes were prepared by deoxyfluorination diastereospecifically in excellent yields. The absolute configuration at the fluorination site was unambiguously assigned by 2D NMR spectroscopy.