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.
Experimental Lineage and Functional Analysis of a Remotely Directed Peptide Epoxidation Catalyst
作者:Phillip A. Lichtor、Scott J. Miller
DOI:10.1021/ja410567a
日期:2014.4.9
describe mechanistic investigations of a catalyst (1) that leads to selective epoxidation of farnesol at the 6,7-position, remote from the hydroxyl directing group. The experimental lineage of peptide 1 and a number of resin-bound peptide analogues were examined to reveal the importance of four N-terminal residues. We examined the selectivity of truncated analogues to find that a trimer is sufficient to
Function-oriented investigations of a peptide-based catalyst that mediates enantioselective allylic alcohol epoxidation.
作者:Nadia C. Abascal、Phillip A. Lichtor、Michael W. Giuliano、Scott J. Miller
DOI:10.1039/c4sc01440e
日期:——
an investigation of a peptide-based catalyst (6) that is effective for the site- (>100:1:1) and enantioselective epoxidation (86% ee) of farnesol. Studies of the substrate scope exhibited by the catalyst are included, along with an exploration of optimized reaction conditions. Mechanistic studies are reported, including relative rate determinations for the catalyst and propionic acid, a historical perspective
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.
Nickel‐Catalyzed Negishi Cross‐Couplings of Secondary Nucleophiles with Secondary Propargylic Electrophiles at Room Temperature
作者:Sean W. Smith、Gregory C. Fu
DOI:10.1002/anie.200802784
日期:2008.11.17
Synthesis of (±)-Aureol by Bioinspired Rearrangements
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.