The synthesis of Krempene B, which can be isolated from the marine soft coral Cladiella krempfi, is achieved in 23.9% overall yield from commercially available 3 beta-acetoxy-5-pregnen-20-one by 11 steps. Key transformations include the dienone phenol rearrangement of steroids and Wittig reaction. (C) 2012 Elsevier Inc. All rights reserved.