Large-scale synthesis of SB-462795, a cathepsin K inhibitor: the RCM-based approaches

Two stereoselective syntheses of SB-462795, a highly potent cathepsin K inhibitor, are described. Both routes feature a C5-C6 disconnection by ring closing metathesis to construct an azepane ring and are amenable to large-scale manufacturing. (C) 2009 Elsevier Ltd. All rights reserved.