Total synthesis of bidensyneosides A2 and C: remarkable protecting group effects in glycosylation
摘要:
Bidensyneosides are a group of five recently identified polyacetylenic glucosides from Bidens parviflora WILLD, a traditional Chinese medicinal plant that contains rich bioactive natural products. It was shown that bidensyneosides inhibited both histamine release and nitric oxide production. The synthesis of bidensyneoside A2 (2) and C (4) as well as 3-deoxybidensyneoside C (5) are described. These syntheses establish a synthetic entry to the bidensyneosides and confirm the stereochemistry at C3. Furthermore, a remarkable protecting Group effect on orthoester formation was observed during the glycosylation reaction. (C) 2004 Elsevier Ltd. All rights reserved.
Stereoselective Total Synthesis of Atractylodemayne A, a Conjugated 2(<i>E</i>),8(<i>Z</i>),10(<i>E</i>)-Triene-4,6-diyne
作者:Bernd Schmidt、Stephan Audörsch
DOI:10.1021/acs.orglett.6b00274
日期:2016.3.4
The first totalsynthesis of the polyacetylene natural product atractylodemayne A is reported. Stereoselective construction of the conjugated 8(Z),10(E)-diene moiety was achieved through a tethered ring-closing metathesis approach, comprising a Ru-catalyzed RCM followed by a base-induced elimination. A Pd-catalyzed Cadiot–Chodkiewicz coupling was used for the synthesis of the diyne. Overall, atractylodemayne
Stereoselective Total Syntheses of Polyacetylene Plant Metabolites via Ester-Tethered Ring Closing Metathesis
作者:Bernd Schmidt、Stephan Audörsch
DOI:10.1021/acs.joc.6b02987
日期:2017.2.3
Totalsyntheses of five naturally occurring polyacetylenes from three different plants are described. These natural products have in common an E,Z-configured conjugated diene linked to a di- or triyne chain. As the key method to stereoselectively establish the E,Z-diene part, an ester-tethered ring-closing metathesis/base-induced eliminative ring opening sequence was used. The results presented herein
Total synthesis of two naturally occurring polyacetylenic glucosides (−)-bidensyneoside A1 and B, and an analogue of (−)-bidensyneoside C
作者:Benjamin W. Gung、Ryan M. Fox、Robert Falconer、Daniel Shissler
DOI:10.1016/j.tetasy.2005.10.027
日期:2006.1
The total syntheses of two novelpolyacetylenic natural products bidensyneoside A1 and B, as well as an analogue of bidensyneoside C are described. These syntheses are based on our recently developed strategy. A new preparation of the required starting material (E)-3-penten-1-yne was developed. The preparation of the analogue of (−)-bidensyneoside C further confirms the side chain configuration of
Natural acetylenes. Part XIX. Metabolites from some Poria species
作者:R. E. Bew、R. C. Cambie、Ewart R. H. Jones、G. Lowe
DOI:10.1039/j39660000135
日期:——
Nemotinic acid (I; RH) and nemotin (II) have been isolated from the culture media of Poria subacida, P. colorea, and P. mutans. P. subacida also yields methyl nemotinate (I; RMe).
从mot酸小color,比色体育和变色体育的培养基中分离出了神经营养酸(I; R H)和神经营养素(II)。亚酸性毕赤酵母也产生神经氨酸甲酯(I; R Me)。
Total synthesis of 1-(Z)-atractylodinol
作者:Juliana M. Oliveira、Gilson Zeni、Ivani Malvestiti、Paulo H. Menezes
DOI:10.1016/j.tetlet.2006.08.130
日期:2006.11
The totalsynthesis of 1-(Z)-atractylodinol, a natural polyacetylenic alcohol with several biological activities, has been achieved using a newly developed telluride synthon and a novel use for the Negishi type coupling reaction employing vinyltellurides.