Total Syntheses of (±)-<i>cis</i>-Trikentrin A and (±)-<i>cis</i>-Trikentrin B via Electrocyclic Ring Closures of 2,3-Divinylpyrrolines
作者:Raymond J. Huntley、Raymond L. Funk
DOI:10.1021/ol061259a
日期:2006.7.1
[Structure: see text] A convergent and versatile strategy for the diastereoselective syntheses of (+/-)-cis-trikentrin A and B in 10 and 12 steps, respectively, from commercially available N-BOC-2-pyrrolidinone is described. The key step in each of the total syntheses is the construction of the central benzene ring via a facile 6pi-electrocyclic ring closure of an appropriately substituted 2,3-divinylpyrroline
Syntheses of (±)- and (-)-cis-trikentrin A, (±)- and (-)-trans-trikentrin A, (±)-cis-trikentrin B, (±)-trans-trikentrin B, and (±)-iso-trans-trikentrin B
Two pathways towards the construction of the trikentrin skeleton are presented, one leading to the total synthesis of (+/-)-cis-Trikentrin A (1). The key step is the intramolecular Heck coupling of the triflate 21 to form the five-membered ring of the indenes 22 and 23.
Boger, Dale L.; Zhang, Minsheng, Journal of the American Chemical Society, 1991, vol. 113, # 11, p. 4230 - 4234