De novo asymmetric synthesis and biological analysis of the daumone pheromones in Caenorhabditis elegans and in the soybean cyst nematode Heterodera glycines
作者:Haibing Guo、James J. La Clair、Edward P. Masler、George A. O'Doherty、Yalan Xing
DOI:10.1016/j.tet.2016.03.033
日期:2016.5
The de novo asymmetric total syntheses of daumone 1, daumone 3 along with 5 new analogs are described. The key steps of our approach are: the diastereoselective palladium catalyzed glycosylation reaction; the Noyori reduction of 2-acetylfuran and an ynone, which introduce the absolute stereochemistry of the sugar and aglycon portion of daumone; and an Achmatowicz rearrangement, an epoxidation and a
Short and Efficient Synthetic Route to Methyl α-Trioxacarcinoside B and Anomerically Activated Derivatives
作者:Thomas Magauer、Andrew G. Myers
DOI:10.1021/ol202315m
日期:2011.10.21
A 9-step syntheticroute to the complex carbohydrate methyl α-trioxacarcinoside B from 2-acetylfuran is described. Anomerically activated forms, including 1-phenylthio, 1-O-(4′-pentenyl), 1-fluoro, and 1-O-acetyl derivatives are also prepared.
Synthesis of Several Cleistrioside and Cleistetroside Natural Products via a Divergent De Novo Asymmetric Approach
作者:Bulan Wu、Miaosheng Li、George A. O’Doherty
DOI:10.1021/ol1023344
日期:2010.12.3
The denovoasymmetric syntheses of several partially acylated dodecanyl tri- and tetra-rhamnoside natural products (cleistriosides-5 and 6 and cleistetrosides-2 to 7) have been achieved (19−24 steps). The divergent route requires the use of three or less protecting groups. The asymmetry was derived via Noyori reduction of an acylfuran. The rhamno-stereochemistry was installed by a diastereoselective
<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
Palladium‐Catalyzed Regioselective and Diastereoselective
<i>C</i>
‐Glycosylation by Allyl‐Allyl Coupling
作者:Junhao Li、Nan Zheng、Xuelun Duan、Rui Li、Wangze Song
DOI:10.1002/adsc.202001136
日期:2021.2.2
A Pd‐catalyzed C‐glycosylation reaction was developed by allyl‐allyl coupling process using Achmatowicz rearrangement products as donors and methylcoumarins as acceptors under mild conditions. This method featured regio‐ and diastereoselectivities, stereodivergent synthesis of C‐glycosides. The glycosyl donors with controlled stereodiversity and glycosyl acceptors with fluorescent performace further