6141-57-7Relevant academic research and scientific papers
Synthetic studies on pseudolaric acid B: Enantioselective synthesis of C4,C10-di-epi-trans-fused [5-7]-bicyclic skeleton
Guo, Rui,Zhai, Hongbin,Li, Yun
, p. 1400 - 1402 (2020/10/07)
Studies on the synthesis of antifungal and anticancer natural product, pseudolaric acid B, have led to the enantioselective synthesis of di-epi-trans-fused [5–7]-bicyclic core skeleton. The synthesis was achieved in 10 linear steps, which features the Sharpless asymmetric epoxidation, cyanide-opening reaction of epoxide, and intramolecular [5 + 2] cycloaddition reaction as the key transformations. The stereochemistry was determined by the X-ray crystallographic analysis.
Diastereoselective photocycloaddition reactions of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furans governed by chiral auxiliaries and hydrogen bonding interactions
Maeda, Hajime,Koshio, Norihiro,Tachibana, Yuko,Chiyonobu, Kazuhiko,Konishi, Gen-ichi,Mizuno, Kazuhiko
, p. 7 - 17 (2017/09/12)
By using chiral auxiliaries and hydrogen bonding interactions, we have developed diastereoselective photocycloaddition of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furan derivatives. In photoreactions of (?)-menthyl 2-naphthalenecarboxylate with furan and 3-furanmethanol, respective maximum 48% and 40% diastereomeric excesses (d.e.) are observed. In photoreactions of di-8-phenyl-(?)-menthyl 2,3-naphthalenedicarboxylate with 3-furanmethanol, maximum 67% d.e. is obtained. Use of solvents of low polarity, low temperatures and low furan concentration leads to increased diastereoselectivities. Variable-temperature (VT) NMR and fluorescence quenching studies indicate that hydrogen bonding interactions between the carbonyl oxygen of naphthalenecarboxylic acid esters and the OH group in 3-furanmethanol take place in both the ground and excited states. The results of computational studies show that geometries of C2 symmetric naphthalenedicarboxylate reactants are important in governing the high diastereoselectivity in the photoreactions of 2,3-naphthalenedicarboxylates.
3-Substituted-(5-arylfuran-2-ylcarbonyl)guanidines as NHE-1 inhibitors
Lee, Sunkyung,Kim, Taemi,Lee, Byung Ho,Yoo, Sung-eun,Lee, Kyunghee,Yi, Kyu Yang
, p. 1291 - 1295 (2008/02/02)
The C-3 substituents effect on NHE-1 inhibitory activity of (5-arylfuran-2-ylcarbonyl)guanidines, previously identified as potent NHE-1 inhibitors, was investigated. The introduction of amine or alkyl groups at the 3-position of the furan ring, next to the acylguanidine moiety, remarkably improves NHE-1 inhibitory potency. Especially the important finding is that 5-(2,5-dichloro)phenyl and 5-(2-methoxy-5-chloro)phenyl derivatives exhibit high NHE-1 inhibitory activities (IC50 0.02 μM) that match those of 3-unsubstituted derivatives.
Anionic [4+2] cycloaddition strategy to linear furocoumarins: Synthesis of 8 methoxypsoralen and its isoster
Mal, Dipakranjan,Bandhyopadhyay, Mousumi,Datta,Murty, Kadiyala V. S. N.
, p. 7525 - 7538 (2007/10/03)
The surfoxide esters 14 and 20d are successfully annulated with bicyclic enone 8 in the presence of (t)BuOLi to provide the pentacyclic ketones 9a and 21a respectively in good yields (≤70%). Flash vacuum pyrolysis of O-methyl derivatives 9b and 21b at - 5000 C/. 1 mm provide furoindacenones 16b and 22b respectively, which in turn are convertible to furocoumarins 1 and 3.
VOLATILE CONSTITUENTS OF CLAUSENA WILLDENOVII: STRUCTURES OF THE FURANOTERPENES α-CLAUSENAN, DICLAUSENAN A AND DICLAUSENAN B
Subba Rao, G. S. R.,Ravindranath, Bhagavatula,Sashi Kumar, V. P.
, p. 399 - 402 (2007/10/02)
Four furanoid terpenic compounds, α-clausenan, rosefuran (γ-clausenan) and diclausenans A and B, were isolated from the essential oil of the leaves of Clausena willdenovii.Their structures were determined by chemical and spectral data.The occurence of a high concentration of rosefuran is noteworthy.Selenium dioxide oxidation of diclausenan gave an unusual product, identified as an epoxy-dicarbonyl compound. - Keywords: Clausena willdenovii; Rutaceae; furanoterpenes; α-clausenan; γ-clausenan (rosefuran); diclausenans A and B.
