40914-19-0Relevant academic research and scientific papers
Revision of the structure and total synthesis of altenuisol
Nemecek, Gregor,Cudaj, Judith,Podlech, Joachim
, p. 3863 - 3870 (2012/09/25)
A total synthesis of the reported structure of altenuisol is described. Comparison of the 1H NMR spectra of the synthesized compound and of the natural product revealed that the originally proposed structure was not correct. Consequently, two constitutional isomers were synthesized. The spectra of one of these compounds - a structure originally proposed as the structure of altertenuol - matched perfectly with the spectra of the natural product. The total synthesis of altenuisol was thus achieved starting with phloroglucinic acid and protocatechuic aldehyde in 10 steps and in 23% yield, where the longest linear sequence consisted of 6 steps. The key step was a Suzuki coupling with concomitant formation of the lactone ring. Whether altertenuol is identical with altenuisol could not be decided. Total synthesis of altenuisol, a minor toxin in ubiquitous Alternaria spp. revealed that the originally proposed structure was not correct. Altenuisol was proved to have an isomeric structure by total synthesis. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Synthesis, structure-activity relationships, and mechanism of action of anti-HIV-1 lamellarin α 20-sulfate analogues
Kamiyama, Haruka,Kubo, Yoshinao,Sato, Hironori,Yamamoto, Naoki,Fukuda, Tsutomu,Ishibashi, Fumito,Iwao, Masatomo
supporting information; experimental part, p. 7541 - 7550 (2012/01/13)
Lamellarin α and six different types of lamellarin α 20-sulfate analogues were synthesized and their structure-activity relationships were investigated using a single round HIV-1 vector infection assay. All lamellarin sulfates having pentacyclic lamellarin core exhibited anti-HIV-1 activity at a 10 μM concentration range regardless of the number and position of the sulfate group. On the other hand, non-sulfated lamellarin α and ring-opened lamellarin sulfate analogues did not affect HIV-1 vector infection in similar concentrations. The lamellarin sulfates utilized in this study did not exhibit unfavorable cytotoxic effect under the concentrations tested (IC50 > 100 μM). Confocal laser scanning microscopic analysis indicated that hydrophilic lamellarin sulfates were hardly incorporated in the cell. HIV-1 Env-mediated cell-cell fusion was suppressed by lamellarin sulfates. These results suggested that lamellarin sulfates have a novel anti-HIV-1 activity besides the previously reported integrase activity inhibition, possibly at a viral entry step of HIV-1 replication.
New approach for the construction of the coumarin frame and application in the total synthesis of natural products
Jerezano, Alberto,Jimenez, Fabiola,Del Carmen Cruz, Maria,Montiel, Luisa E.,Delgado, Francisco,Tamariz, Joaquin
, p. 185 - 198 (2011/04/17)
A new synthetic approach is described for building the coumarin scaffold through the Lewis acid-promoted cyclization of novel aryl 3-(dimethylamino)prop- 2-enoates 2a - 2f. The latter precursors were prepared via aminomethylenation of the corresponding aryl acetates 4a - 4f with the Bredereck reagent. This approach was used for the synthesis of biologically active natural compounds 1a - 1f, through a three-step procedure starting from the corresponding phenols.
Synthesis of lamellarin U and lamellarin G trimethyl ether by alkylation of a deprotonated α-aminonitrile
Liermann, Johannes C.,Opatz, Till
, p. 4526 - 4531 (2008/09/21)
(Chemical Equation Presented) 1,2,3,4-Tetrahydroisoquinoline-1- carbonitriles can serve as starting materials for the one-pot synthesis of 5,6-dihydropyrrolo[2,1a]isoquinolines and 1-benzyl-3,4-dihydroisoquinolines. The latter compounds were transformed to lamellarin G trimethyl ether and lamellarin U in short reaction sequences. This method allows the introduction of acid-sensitive protecting groups for the phenolic hydroxy functions which would be cleaved under the harsh conditions of the classical Bischler-Napieralski reaction.
Synthesis of dictyomedins using phosphazene base catalyzed diaryl ether formation
Ebisawa, Masaru,Ueno, Masahiro,Oshima, Yoshiteru,Kondo, Yoshinori
, p. 8918 - 8921 (2008/03/14)
Dictyomedins isolated from dictyostelium cellular slime molds were synthesized by using diaryl ether derivatives as key intermediates for the cyclization to dibenzofuran followed by palladium catalyzed intramolecular biaryl formation.
Structure-activity relationship of wedelolactone analogues: Structural requirements for inhibition of Na+,K+-ATPase and binding to the central benzodiazepine receptor
Pocas, Elisa S.C.,Lopes, Daniele V.S.,da Silva, Alcides J.M.,Pimenta, Paulo H.C.,Leitao, Fernanda B.,Netto, Chaquip D.,Buarque, Camilla D.,Brito, Flavia V.,Costa, Paulo R.R.,Noel, Francois
, p. 7962 - 7966 (2007/10/03)
Coumestans 2a-i, bearing different patterns of substitution in A- and D-rings, were synthesized and evaluated as inhibitors of kidney Na+,K+-ATPase and ligands for the central benzodiazepine (BZP) receptor. The presence of a hydroxyl group in position 2 favours the effect on Na+,K+-ATPase but decreases the affinity for the BZP receptor, allowing the design of more selective molecules than the natural wedelolactone. On the other hand, the presence of a catechol in ring D is important for the effect on both molecular targets.
1,2-AZOLE DERIVATIVES WITH HYPOGLYCEMIC AND HYPOLIPIDEMIC ACTIVITY
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Page 282, (2010/02/05)
A compound represented by the formula (1) wherein ring A is a ring optionally having 1 to 3 substituents; ring B is a 1,2-azole ring which may further have 1 to 3 substituents; Xa, Xb and Xc are the same or different and each is a bond, - O -, - S - and the like; Ya is a divalent aliphatic hydrocarbon residue having 1 to 20 carbon atoms; Yb and Yc are the same or different and each is a bond or a divalent aliphatic hydrocarbon residue having 1 to 20 carbon atoms; ring C is a monocyclic aromatic ring which may further have 1 to 3 substituents; and R represents -OR4 (R4 is hydrogen atom or optionally substituted hydrocarbon group) and the like, or a salt thereof or a prodrug thereof is useful as an agent for the prophylaxis or treatment of diabetes and the like.
Oxamic acids and derivatives as thyroid receptor ligands
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, (2008/06/13)
The present invention provides novel compounds of the Formula and prodrugs thereof, geometric and optical isomers thereof, and pharmaceutically acceptable salts of such compounds, prodrugs and isomers, wherein R1—R8 and W are as desc
Antimitotic and cell growth inhibitory properties of combretastatin A-4-like ethers
Lawrence, Nicholas J.,Rennison, David,Woo, Meiki,McGown, Alan T.,Hadfield, John A.
, p. 51 - 54 (2007/10/03)
A series of diarylamines, diaryl and arylbenzyl ethers based on combretastatin A-4 was prepared and evaluated for anticancer activity. 2-Methoxy-5-(3',4',5'-trimethoxyphenoxymethyl)phenol was the most active (IC50, K562 20 nM) and caused significant G2/M cell cycle arrest. (C) 2000 Elsevier Science Ltd.
Synthesis and preliminary pharmacological evaluation of coumestans with different patterns of oxygenation
Da Silva, Alcides J.M.,Melo, Paulo A.,Silva, Noelson M.V.,Brito, Flavia V.,Buarque, Camilla D.,De Souza, Daniele V.,Rodrigues, Veronica P.,Pocas, Elisa S.C.,Noel, Francois,Albuquerque, Edson X.,Costa, Paulo R.R.
, p. 283 - 286 (2007/10/03)
Five coumestans with different patterns of oxygenation in rings A and D were synthesized from resorcinol and aromatic aldehydes, and screened for their antimyotoxic activity. The most potent compound (2b, IC50 = 1 μM) was selected for study of
