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.
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.