1352318-83-2Relevant academic research and scientific papers
Total synthesis of (+)-seco-C-oleanane via stepwise controlled radical cascade cyclization
Domingo, Victoriano,Arteaga, Jesus F.,Lopez Perez, Jose Luis,Pelaez, Rafael,Quilez Del Moral, Jose F.,Barrero, Alejandro F.
, p. 341 - 350 (2012)
An asymmetric concise total synthesis of the (+)-seco-C-oleanane 1 was accomplished. The successful route to this natural product involves as the key step a stepwise regio- and stereocontrolled catalytic radical polyene cascade cyclization from preoleanatetraene oxide (16), a process mediated by Cp 2TiCl. The use of this single-electron-transfer complex permits mild cyclization conditions without using unnecessary prefunctionalizations and stops the process at the bicyclic level. Theoretical data revealed high activation energy for the third ring closure, which would account for the control of the cyclization. This process also led to natural (-)-achilleol B, camelliol A, and (+)-seco-β-amyrin as minor compounds.
