Enantioselective Total Synthesis of (−)-Terengganensine A
作者:Cyril Piemontesi、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201602374
日期:2016.5.23
A seven‐step enantioselective total synthesis of (−)‐terengganensine A, a complex heptacyclic monoterpene indole alkaloid, was accomplished. Key steps included: a) Noyori's catalytic enantioselective transfer hydrogenation of the iminium salt to set up the absolute configuration at the C21 position; b) a highly diastereoselective C7 benzoyloxylation with dibenzoyl peroxide under mild conditions; and
Synthesis of Eburnamine, Isoeburnamine, and Eburnamoninevia a Spirocyclic Intermediate
作者:Tse-Lok Ho、Chun-Kuei Chen
DOI:10.1002/hlca.200590216
日期:2005.10
Racemic eburnamonine (1) was synthesized via6, an intermediate possessing local symmetry. Cleavage of the cyclopentene subunit led to pentacyclic aldehydes 8a/8b which on subsequent borohydride and Wolff–Kishner reductions gave 12. The final steps included a RuCl3-catalyzed periodate oxidation and pyridinium chlorochromate (PCC) oxidation. The penultimate intermediates were racemic eburnamine (2) and