Synthesis of 7-oxa-phomopsolide E and its C-4 epimer
作者:Miaosheng Li、Jana Scott、George A. O’Doherty
DOI:10.1016/j.tetlet.2003.11.089
日期:2004.1
A flexible, enantioselective route to highly functionalized α,β-unsaturated δ-lactones has been applied to the synthesis of 7-oxa-phomopsolide E and its C-4 epimer. This approach relies on the application of the Noyori asymmetric hydrogenation of furyl ketone to produce the secondary furyl alcohol in high enantioexcess, which can be stereoselectively transformed into α,β-unsaturated-δ-lactones by a
A unified strategy for the synthesis of the C1–C14 fragment of marinolic acids, mupirocins, pseudomonic acids and thiomarinols: total synthesis of pseudomonic acid methyl monate C
作者:Y. Sridhar、P. Srihari
DOI:10.1039/c4ob00025k
日期:——
A flexible stereoselective approach to the common C1–C14 skeleton present in natural products of the pseudomonic acid family is described. The strategy has been extended and the totalsynthesis of pseudomonic acid methyl monate C was achieved. The key synthetic reactions utilized include Achmatowicz rearrangement, Johnson–Claisenrearrangement, Julia–Kocienski olefination, and Horner–Wadsworth–Emmons
Application of the Wharton Rearrangement for the de novo Synthesis of Pyranosides with<i>ido</i>,<i>manno</i>, and<i>colito</i>Stereochemistry
作者:Michael F. Cuccarese、Hua-Yu Leo Wang、George A. O'Doherty
DOI:10.1002/ejoc.201300051
日期:2013.5
A denovo asymmetric synthesis of α-ido-pyranosides, as well as several deoxy and amino variants, has been achieved. The procedure involves a palladium(0)-catalyzed glycosylation in combination with a Whartonrearrangement/epoxide-opening reaction sequence to access sugars with ido, manno, and colito stereochemistry as well as several azido analogues.
<i>De Novo</i> Asymmetric Synthesis of All-<scp>d</scp>-, All-<scp>l</scp>-, and <scp>d</scp>-/<scp>l</scp>-Oligosaccharides Using Atom-less Protecting Groups
作者:Ravula Satheesh Babu、Qian Chen、Sang-Woo Kang、Maoquan Zhou、George A. O’Doherty
DOI:10.1021/ja305321e
日期:2012.7.25
and C-O π-bond functionality, as atom-less protecting groups as well as an anomeric directing group (via a Pd-π-allyl), highlights the atom-economical aspects of the route to a divergent set of natural and unnatural oligosaccharides (i.e., various d-/l-diastereomers of oligosaccharides as well as deoxysugars which lack C-2 anomeric directing groups). For example, in only 12 steps, the construction of
A Palladium-Catalyzed Glycosylation Reaction: The de Novo Synthesis of Natural and Unnatural Glycosides
作者:Ravula Satheesh Babu、George A. O'Doherty
DOI:10.1021/ja037097k
日期:2003.10.1
sterospecific palladium-catalyzedglycosylationreaction of a variety of alcohols is reported. The reaction selectively converts alpha-2-substituted 6-carboxy-2H-pyran-3(6H)-ones into alpha-2-substituted 6-alkoxy-2H-pyran-3(6H)-ones with complete retention of configuration and similarly converts the pyranones with beta-carboxy groups into pyranones with beta-alkoxy groups. The reaction works equally