Concise Total Synthesis of Helicascolides A, B, and C
摘要:
The concise total synthesis of helicascolides A, B, and C has been achieved in seven steps starting from commercially available tiglic aldehyde [(E)-2,3-dimethylacrylaldehyde]. Oppolzer's sultam aldol, Mukaiyama aldol, and Dess-Martin periodinane oxidation reactions are the key steps involved in the target synthesis.
Concise synthesis and revision of the proposed biogenesis of helicascolides
作者:Kuan Zheng、Changmin Xie、Ran Hong
DOI:10.1016/j.tetlet.2017.10.021
日期:2017.11
A concise synthesis of helicascolides A, B and C was achieved in three to five steps from commercially available materials. The key transformations of the synthesis include an Evans-Metternich anti-aldol reaction of the known β-keto imide 10 and strategic base-mediated one-pot cyclization/alkylation. Based on the new chemical evidence of ring-opening reaction of β-keto ester under biocompatible basic