Studies directed toward the first total synthesis of acremodiol and acremonol
摘要:
Studies directed toward the synthesis of acremodiol and acremonol resulted in the synthesis of two macrodiolides 1, la, and 2 besides 3. The attempted synthesis of 1 and 2 confirmed that the absolute stereochemistry defined in the earlier report is incorrect. Compound I was synthesized by RCM-mediated macrocyclization. Attempted synthesis of 2 failed to give good yields in the cyclization, and la and 2 were synthesized by the Yamaguchi macrolactonization method. (C) 2009 Elsevier Ltd. All rights reserved.
AbstractAn efficient and short total synthesis of (−)‐cleistenolide (1) from D‐mannitol with an overall yield of 23.6% is described. The chiron approach for the synthesis of (−)‐cleistenolide involves a one‐C‐atom Wittig olefination, a selective allylic triethylsilyl protection, and a Grubbs‐catalyzed ring‐closure‐metathesis (RCM) reaction as the key steps.