4105-60-6Relevant academic research and scientific papers
Total synthesis of marine natural products separacenes A and B
Das, Subhendu,Goswami, Rajib Kumar
, p. 4842 - 4850 (2017/07/10)
A short and convergent route for the stereoselective total synthesis of separacenes A and B has been developed using (+)-methyl d-lactate and d-(-)-tartaric acid as the chiral pools. The characteristic features of this synthesis include the Trost-Rychnovsky alkyne rearrangement to construct the C7-C9 conjugated diene, the Horner-Wadsworth-Emmons olefination to form the C5-C6 and C11-C12 olefins and the Corey-Bakshi-Shibata reaction to install the C-13 hydroxy functionality.
Chiron approach for the total synthesis of (+)-synargentolide B
Liu, Jun,Gao, Yangguang,Wang, Linlin,Du, Yuguo
, p. 6443 - 6447 (2017/10/09)
A concise and efficient chiron approach for the total synthesis of natural product synargentolide B was achieved in 10 steps with overall yields of 11.3% from D-mannitol and L-ethyl lactate. The key reactions included anti-Barbier allylation, cross-metathesis, and an intramolecular Yamaguchi esterification.
Tandem ring-closing/cross-metathesis approach for the synthesis of synargentolide B and its stereoisomers
Sabitha, Gowravaram,Shankaraiah, Kontham,Yadav, Jhillu S.
, p. 4870 - 4878 (2013/08/23)
The stereoselective syntheses of synargentolide B and its three stereoisomers have been accomplished from L-(+)- and D-(-)-diethyl tartrates, D-ribose, and D-mannitol as chiral pool starting materials. The key step was a tandem ring-closing/cross-metathes
Epi -, Epoxy-, and C2-modified bengamides: Synthesis and biological evaluation
Sarabia, Francisco,Martín-Gálvez, Francisca,García-Ruiz, Cristina,Sánchez-Ruiz, Antonio,Vivar-García, Carlos
, p. 5239 - 5253 (2013/07/26)
With the objective of investigating the influence of structural modifications of the polyketide chain of the bengamides upon their antitumoral activities, we targeted the preparation of bengamide E analogues with modification of the stereochemistry at C-2 and at C-3, the substituent at the C-2 position, and the presence of oxirane rings. For the synthesis of these analogues, a new synthetic method for asymmetric epoxidation, developed in our laboratories, was employed utilizing the chiral sulfonium salts 22 and 23. In order to access 2-epi-bengamide E from these epoxy amides, a synthetic methodology, developed by Miyashita, allowed an oxirane-ring-opening reaction with a double inversion of the configuration. Alternatively, an aldol reaction provided access to the same analogue in a shorter and more efficient manner. Finally, biological evaluation of all of these bengamide E analogues demonstrated that the polyketide chain is essential for the antitumor activity of these natural products, not being amenable to structural or configurational modifications.
Stereoselective and facile total synthesis of (+)-goniodiol, a styryllactone from carbohydrates
Yadav, Jhillu Singh,Das, Saibal,Mishra, Anand Kumar
experimental part, p. 2443 - 2447 (2011/02/22)
The stereoselective synthesis of (+)-goniodiol, a cytotoxic styryllactone, has been accomplished in 10 steps starting from inexpensive and readily available d-manitol and δ-gluconolactone involving the direct and straightforward reaction conditions of Gri
Doubly diastereoselective conjugate addition of homochiral lithium amides to homochiral α,β-unsaturated esters containing cis- and trans-dioxolane units
Davies, Stephen G.,Durbin, Matthew J.,Goddard, Euan C.,Kelly, Peter M.,Kurosawa, Wataru,Lee, James A.,Nicholson, Rebecca L.,Price, Paul D.,Roberts, Paul M.,Russell, Angela J.,Scott, Philip M.,Smith, Andrew D.
supporting information; experimental part, p. 761 - 776 (2009/06/19)
As part of a long-term goal directed towards the ab initio asymmetric synthesis of unnatural amino sugars, the doubly diastereoselective conjugate addition reactions of the antipodes of lithium N-benzyl-N-(α-methylbenzyl) amide to a range of homochiral α,β-unsaturated esters containing cis- and trans-dioxolane units was investigated. These reactions resulted in "matching" and "mismatching" effects. In the "matched" cases a single diastereoisomer of the corresponding β-amino ester (containing three contiguous stereocentres) is produced. Upon conjugate addition to a homochiral α,β-unsaturated ester containing a cis-dioxolane unit, in the "mismatched" case it is the stereocontrol of the substrate which is dominant over that of the lithium amide, whilst upon addition to homochiral α,β-unsaturated esters containing a trans-dioxolane unit the stereocontrol of the homochiral lithium amide is dominant. Hydrogenolytic N-deprotection of the β-amino ester products of conjugate addition gives access to polyoxygenated β-amino acid derivatives.
Total syntheses of (+)-7-epi-goniofufurone, (+)-goniopypyrone and (+)-goniofufurone from a common precursor
Yadav, Veejendra K.,Agrawal, Divya
, p. 5232 - 5234 (2008/09/20)
Total syntheses of (+)-7-epi-goniofufurone, (+)-goniopypyrone and (+)-goniofufurone have been achieved from an advanced common precursor formed from d-(+)-mannitol by changing the carbinol protection profile. The Royal Society of Chemistry.
Total synthesis of amphidinolide E and amphidinolide E stereoisomers
Va, Porino,Roush, William R.
, p. 5768 - 5796 (2008/02/02)
Four amphidinolide E stereoisomers, amphidinolide E (1), 2-epi-amphidinolide E (2), 19-epi-amphidinolide E (3), and 2-epi-19-epi-amphidinolide E (4), have been synthesized via the judicious union of aldehyde 5, allylsilanes 7 or 8, acids 9 or 10, and viny
Total synthesis of amphidinolide E
Va, Porino,Roush, William R.
, p. 15960 - 15961 (2007/10/03)
A convergent and highly stereocontrolled synthesis of amphidinolide E (1) has been accomplished. The synthesis features a highly diastereoselective (>20:1) BF3·Et2O promoted [3+2] annulation reaction between aldehyde 3 and allylsilan
Synthesis of (+)-goniothalesdiol and (+)-7-epi-goniothalesdiol
Babjak, Matej,Kapitán, Peter,Gracza, Tibor
, p. 2471 - 2479 (2007/10/03)
A total synthesis of (+)-goniothalesdiol, a 3,4-dihydroxy-2,5-disubstituted tetrahydrofuran isolated from Goniothalamus borneensis (Annonaceae), and its 7-epimer is reported using oxycarbonylation methodology for construction of polyhydroxylated substitut
