Synthetic studies on quassimarin and simalikalactone D: functionalization of ring C
摘要:
The tricycle 18 containing the oxygenated ring C is constructed from (S)-carvone in 14 steps involving a Shapiro reaction and a selective acylation as the key steps. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthetic studies on quassimarin and simalikalactone D: functionalization of ring C
摘要:
The tricycle 18 containing the oxygenated ring C is constructed from (S)-carvone in 14 steps involving a Shapiro reaction and a selective acylation as the key steps. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthetic Studies towards Pentacyclic Quassinoids: Total Synthesis of Unnatural (−)-14-epi-Samaderine E and Natural (−)-Samaderine Y from (S)-(+)-Carvone
作者:Tony K. M. Shing、Ying-Yeung Yeung
DOI:10.1002/chem.200600669
日期:2006.11.6
First totalsyntheses of unnatural (-)-14-epi-samaderine E (5) and natural (-)-samaderine Y (2) were accomplished from (S)-(+)-carvone (6) in 18 and 21 steps, respectively. The syntheses are short, efficient (with an average yield of 80 % plus for each transformation), enantiospecific, and produce nine new chiral centers. The crucial points of the syntheses included a regioselective allylic oxidation