Asymmetric Total Synthesis of the Complex Polycyclic Xanthone FD‐594

A highly convergent approach was developed to achieve the first asymmetric and scalable total synthesis of FD‐594, a complex polycyclic xanthone natural product from Streptomyces sp. TA‐0256, in a longest linear sequence (LLS) of 20 steps. The trans‐9,10‐dihydrophenanthrene‐9,10‐diol fragment (B‐C‐D...

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Veröffentlicht in:Angewandte Chemie 2020-03, Vol.132 (11), p.4390-4394
Hauptverfasser: Xie, Tao, Zheng, Chaoying, Chen, Kuanwei, He, Haibing, Gao, Shuanhu
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Zheng, Chaoying
Chen, Kuanwei
He, Haibing
Gao, Shuanhu
description A highly convergent approach was developed to achieve the first asymmetric and scalable total synthesis of FD‐594, a complex polycyclic xanthone natural product from Streptomyces sp. TA‐0256, in a longest linear sequence (LLS) of 20 steps. The trans‐9,10‐dihydrophenanthrene‐9,10‐diol fragment (B‐C‐D ring) was generated through a new strategy involving asymmetric dihydroxylation followed by Cu‐mediated oxidative cyclization. Late‐stage stereoselective glycosylation assembled the angular hexacyclic framework with a β‐linked 2,6‐dideoxy trisaccharide fragment. Die asymmetrische Totalsynthese des polycyclischen Xanthons FD‐594 gelang durch einen konvergenten und skalierbaren Ansatz. Das trans‐9,10‐Dihydrophenanthren‐9,10‐diol‐Fragment (B‐C‐D‐Ring) wurde durch eine asymmetrische Dihydroxylierung, gefolgt von einer Cu‐vermittelten oxidativen Cyclisierung, erzeugt. Bei der späten stereoselektiven Glykosylierung wurde das hexacyclische Gerüst mit einem β‐verknüpften 2,6‐Dideoxy‐Trisaccharidfragment zusammengesetzt.
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subjects Asymmetry
Chemistry
Dihydrophenanthrene
Glycosylation
Glykosylierung
Natural products
Naturstoffe
Oligosaccharides
Oxidative Cyclisierung
Stereoselectivity
Synthesis
Totalsynthese
Xanthone
title Asymmetric Total Synthesis of the Complex Polycyclic Xanthone FD‐594
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