Isolation, Structure, and Total Synthesis of the Marine Macrolide Mangrolide D
作者:Junyu Gong、Wei Li、Peng Fu、John MacMillan、Jef K. De Brabander
DOI:10.1021/acs.orglett.9b01126
日期:2019.4.19
The isolation, characterization, and totalsynthesis of the macrocyclic polyene mangrolide D is reported. A 16-step totalsynthesis relies on robust Suzuki and ring-closing metathesis reactions, and an iron-catalyzed hydroazidation of an exomethylene substituted tetrahydropyran as a key step for the synthesis of the appended 4- epi-vancosamine sugar. Although mangrolide D did not display antibiotic
Stereospecific C‐Glycosylation by Mizoroki–Heck Reaction: A Powerful and Easy‐to‐Set‐Up Synthetic Tool to Access<i>α</i>‐ and<i>β</i>‐Aryl‐<i>C</i>‐Glycosides
A stereospecific Mizoroki–Heck cross‐coupling of differently substituted glycals with haloarenes resulting in the exclusive formation of either α‐ or β‐aryl‐C‐glycosides depending solely on the configuration at C3 was achieved. The reaction was easy to set up because no specific precautions were required concerning moisture or oxygen, and it proceeded by a chirality transfer from C3 to C1. After optimization
A Ring Expansion–Glycosylation Strategy toward the Synthesis of Septano-oligosaccharides
作者:Perali Ramu Sridhar、Patteti Venukumar
DOI:10.1021/ol302677z
日期:2012.11.2
ring-expansion–glycosylation reaction was performed using 1,2-cyclopropanated sugars as glycosyl donors and carbohydrate O-nucleophiles as acceptors to provide septanohexose mimics of pyranose and furanosederivatives. The methodology was successfully extended to the synthesis of septano-oligosaccharides by adopting a divergent strategy as well as an iterative protocol.
Stereospecific Synthesis of the Saccharosamine-Rhamnose-Fucose Fragment Present in Saccharomicin B
作者:Marissa Bylsma、Clay S. Bennett
DOI:10.1021/acs.orglett.8b02028
日期:2018.8.3
A synthetic route has been developed for constructing the d-saccharosamine-l-rhamnose-d-fucose (Sac-Rha-Fuc) trisaccharide fragment present in the antibacterial natural product saccharomicin B. The Sac monosaccharide was synthesized through a modified nine step procedure starting from d-rhamnal in 23% overall yield. 1-O-TBS Sac donors were used to construct the β-linked Sac-Rha disaccharide. This disaccharide
开发了一种合成路线,用于构建抗菌天然产物糖霉素 B 中存在的d-蔗糖胺-l-鼠李糖-d-岩藻糖 (Sac-Rha-Fuc) 三糖片段。Sac 单糖是通过改进的九步程序合成的来自d-鼠李糖醛的总产率为23%。1- O -TBS Sac 供体用于构建 β-连接的 Sac-Rha 二糖。该二糖在 BSP/Tf 2 O 条件下与 Fuc 受体偶联,得到适当功能化的三糖,用于精制糖霉素 B。