7766-48-5Relevant academic research and scientific papers
Total synthesis of guanacastepene A: A route to enantiomeric control
Mandal, Mihirbaran,Yun, Heedong,Dudley, Gregory B.,Lin, Songnian,Tan, Derek S.,Danishefsky, Samuel J.
, p. 10619 - 10637 (2005)
The goal of the total synthesis of guanacastepene A served as a focus to bring together several chemical inquiries. One involved the synthesis of fused 5,7-hydrazulenones (see structure 20). Another issue had to do with the mechanistic intermediates in re
Photocycloisomerization of Boc-protected 5-alkenyl-2,5-dihydro-1H-pyrrol-2-ones
Wrobel, Matthias N.,Margaretha, Paul
, p. 515 - 521 (2003)
On irradiation (254 nm), the newly synthesized Boc-protected 5-alkenyl-2,5-dihydro-1H-pyrrol-2-ones 13 undergo regioselective intramolecular [2 + 2] photocycloadditions. While the allyl derivatives 13a-13c afford mainly azatricyclo[3.3.0.02.7]octanones, i.e., crossed cycloadducts, the butenyl- and pentenyl-substituted compounds 13d and 13e isomerize preferentially to straight cycloadducts.
Asymmetric Reductive Carbocyclization Using Engineered Ene Reductases
Heckenbichler, Kathrin,Schweiger, Anna,Brandner, Lea Alexandra,Binter, Alexandra,Toplak, Marina,Macheroux, Peter,Gruber, Karl,Breinbauer, Rolf
supporting information, p. 7240 - 7244 (2018/06/15)
Ene reductases from the Old Yellow Enzyme (OYE) family reduce the C=C double bond in α,β-unsaturated compounds bearing an electron-withdrawing group, for example, a carbonyl group. This asymmetric reduction has been exploited for biocatalysis. Going beyond its canonical function, we show that members of this enzyme family can also catalyze the formation of C?C bonds. α,β-Unsaturated aldehydes and ketones containing an additional electrophilic group undergo reductive cyclization. Mechanistically, the two-electron-reduced enzyme cofactor FMN delivers a hydride to generate an enolate intermediate, which reacts with the internal electrophile. Single-site replacement of a crucial Tyr residue with a non-protic Phe or Trp favored the cyclization over the natural reduction reaction. The new transformation enabled the enantioselective synthesis of chiral cyclopropanes in up to >99 % ee.
Switching substitution groups on the in-tether chiral centre influences backbone peptides' permeability and target binding affinity
Jiang, Yixiang,Hu, Kuan,Shi, Xiaodong,Tang, Qingzhuang,Wang, ZiChen,Ye, Xiyang,Li, Zigang
supporting information, p. 541 - 544 (2017/01/25)
Different substitution groups on the in-tether chiral centre of chirality-induced helical peptides (CIH peptides) showed distinguishable effects on the peptides' cellular uptakes and binding affinities with the estrogen receptor α(ER-α). This study proves that in-tether chiral centres are a valuable modification site for constructing peptide ligands with preferable biophysical properties.
Improved synthesis of unnatural amino acids for peptide stapling
Li, Bo,Zhang, Jie,Xu, Yongjuan,Yang, Xiaoxiao,Li, Li
supporting information, p. 2374 - 2377 (2017/05/29)
The procedures for the synthesis of various α-alkenyl and alkyne amino acids were systematically optimized in light of enhancing atom economy, reducing hazardous reagent usage, and simplifying workup. By starting with Boc-Pro-OH and coupling with EDCI/DMAP followed by alkylation, chiral auxiliary was synthesized with high yield and enantioselectivity. For alkylation of the chiral complex, tBuONa was found and proved by quantitative calculation to be superior to tBuOK in generating more nucleophilic enolate salt, thereby can significantly enhance yield under room temperature. Final Fmoc protection was also dramatically facilitated in one-pot sequential manner by adding EDTA-2Na as the nickel chelator. Synthesis of α-bisalkenyl amino acid was also accomplished by achiral complex approach with high yield and efficacy. Accordingly, five most commonly used N-Fmoc protected α-alkenyl and alkynyl amino acids were synthesized and characterized.
Ligand-Enabled, Copper-Catalyzed Regio- and Stereoselective Synthesis of Trialkylsubstituted Alkenylboronates from Unactivated Internal Alkynes
Itoh, Taisuke,Shimizu, Yohei,Kanai, Motomu
supporting information, p. 7528 - 7531 (2016/07/06)
We report the first copper-catalyzed regio- and stereoselective borylalkylation of dialkylsubstituted internal alkynes with bis(pinacolato)diboron and alkyl halides. A catalytically generated borylcopper species containing a novel π-accepting N-heterocycl
Stabilized alpha helical peptides and uses thereof
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Sheet 2, (2016/05/19)
Novel polypeptides and methods of making and using the same are described herein. The polypeptides include cross-linking (“hydrocarbon stapling”) moieties to provide a tether between two amino acid moieties, which constrains the secondary structure of the polypeptide. The polypeptides described herein can be used to treat diseases characterized by excessive or inadequate cellular death.
STITCHED POLYPEPTIDES
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Page/Page column 101, (2017/01/02)
The present invention provides inventive stitched polypeptides, pharmaceutical compositions thereof, and methods of making and using inventive stitched polypeptides.
Monosubstituted alkenyl amino acids for peptide "stapling"
Yeo, David J.,Warriner, Stuart L.,Wilson, Andrew J.
supporting information, p. 9131 - 9133 (2013/09/24)
Alkenylglycine amino acids were assessed as potential candidates for hydrocarbon stapling and shown to be effective in stapling of the BID BH3 peptide.
HEPATITIS C VIRUS INHIBITORS
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Page/Page column 94-95, (2011/08/08)
The present invention discloses compounds of Formula (I), and pharmaceutically acceptable salts, esters, or prodrugs thereof: Q-G-A-L-B-W (I) which inhibit RNA-containing virus, particularly the hepatitis C virus (HCV). Consequently, the compounds of the
