Synthesis of (±)-Aureol by Bioinspired Rearrangements
摘要:
A bioinspired and sustainable procedure for the straightforward synthesis of (+/-)-aureol has been achieved in eight steps (14% overall yield) from epoxyfarnesol. The key steps are the titanocene(III)-catalyzed radical cascade cyclization of an epoxyfarnesol derivative and a biosynthetically inspired sequence of 1,2-hydride and methyl shifts.
Synthesis of (±)-Aureol by Bioinspired Rearrangements
摘要:
A bioinspired and sustainable procedure for the straightforward synthesis of (+/-)-aureol has been achieved in eight steps (14% overall yield) from epoxyfarnesol. The key steps are the titanocene(III)-catalyzed radical cascade cyclization of an epoxyfarnesol derivative and a biosynthetically inspired sequence of 1,2-hydride and methyl shifts.
Synthetic Access to Bent Polycycles by Cation-π Cyclization
作者:Ryan A. Shenvi、E. J. Corey
DOI:10.1021/ol101410g
日期:2010.8.6
The presence of an ether oxygen within a chain undergoing cation-polyene cyclization has a profound Influence on the stereochemistry of this important construction, apparently due to nucleophilic participation of oxygen in the cyclization process and formation of an oxonium intermediate, leading to bent fused ring systems.