Combined Metalation-Palladium-Catalyzed Cross Coupling Strategies. A Formal Synthesis of the Marine Alkaloid Amphimedine
摘要:
The synthesis of 5-(4-pyridyl)benzo[c][2,7]naphthyridin-4-one (4), an intermediate previously employed in a total synthesis of the marine alkaloid, amphimedine (2), is reported. The route comprises the Pd-catalyzed Suzuki cross coupling of pyridylborane 21 with 2-iodoaniline to give the azabiaryl 22, which upon LDA-mediated cyclization and triflation leads to benzonaphthyridine 5. Stille cross coupling of 5 with pyridylstannane 24 affords the pyridylbenzonaphthyridine 25, which upon BBr3 treatment leads to the target molecule 4. Pyridine directed ortho metalation chemistry leading to halonicotinate ester 12 and amides 14a,b and cross coupling to benzonaphthyridinones 17, 18 (one-pot procedure) and azabiaryls 20a,b are also reported.
Rhodium(I)-Catalyzed Aryl C–H Carboxylation of 2-Arylanilines with CO<sub>2</sub>
作者:Yuzhen Gao、Zhihua Cai、Shangda Li、Gang Li
DOI:10.1021/acs.orglett.9b01105
日期:2019.5.17
An unprecedented Rh(I)-catalyzed, amino-group-assisted C–H carboxylation of 2-arylanilines with CO2 under redox-neutral conditions has been developed. This reaction was promoted by a phosphine ligand with t-BuOK as the base and did not require the use of additional strong organometallic reagent. It enabled an efficient direct conversion of a broad range of 2-(hetero)arylanilines including electron-deficient
[EN] TREATMENT OF MCI AND ALZHEIMER'S DISEASE<br/>[FR] TRAITEMENT DU TCL ET DE LA MALADIE D'ALZHEIMER
申请人:UNIV KENTUCKY RES FOUND
公开号:WO2011142778A1
公开(公告)日:2011-11-17
The present invention provides, among other things, therapeutic compositions and methods that can effectively treat, slow or prevent a neurological disease (e.g., a neurodegenerative disease, e.g., mild cognitive impairment (MCI) or Alzheimer's disease (AD)), in particular, based on therapeutically effective amount of nifedipine, oxidized or nitroso nifedipine derivatives, lactam (e.g., a compound of formula (Ic) or (Ic-i), e.g., NFD- L1), thyroxine (T4), triiodothyronine (T3) and combinations thereof.
Design and Synthesis of Poly ADP-ribose Polymerase-1 Inhibitors. 2. Biological Evaluation of Aza-5[<i>H</i>]-phenanthridin-6-ones as Potent, Aqueous-Soluble Compounds for the Treatment of Ischemic Injuries
A series of aza-5[H]-phenanthridin-6-ones were synthesized and evaluated as inhibitors of poly ADP-ribose polymerase-1 (PARP-1). Inhibitory potency of the unsubstituted aza-5[H]-phenanthridin-6-ones (i.e., benzonaphyhyridones) was dependent on the position of the nitrogen atom within the core structure. The A ring nitrogen analogues (7-, 8-, and 10-aza-5[H]-phenanthridin-6-ones) were an order of magnitude less potent than C ring nitrogen analogues (1-, 2-, 3-, and 4-aza-5[H]-phenanthridin-6-ones). Preliminary stroke results from 1- and 2-aza-5[H]-phenanthridin-6-one prompted structure-activity relationships to be established for several 2- and 3-substituted 1-aza-5[H]-phenanthridin-6-ones. The 2-substituted 1-aza-5[H]-phenanthridin-6-ones were designed to improve the solubility and pharmacokinetic profiles for this series of PARP-1 inhibitors. Most importantly, three compounds from this series demonstrated statistically significant protective effects in rat models of stroke and heart ischemia.
A new, direct, and efficient synthesis of benzonaphthyridin-5-ones
作者:Thomas Cailly、Frédéric Fabis、Sylvain Rault
DOI:10.1016/j.tet.2006.04.030
日期:2006.6
Microwave-assisted Suzuki cross-coupling reaction of 2-fluorophenylboronic acid with all orthochlorocyanopyridine isomers allowed the rapid syntheses of key intermediates for anionic ring closure, which was performed using potassium hydroxide under microwave irradiation to give benzonaphthyridin-5-ones in high yields. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of Various Substituted Benzo[c]-2,7-naphthyridines and an Approach towards the Skeleton of Meridine. Considerations about the Effect of Copper(II) Oxide