Palladium-Promoted Cascade Reactions of Isonitriles and 6-Iodo-N-propargylpyridones: Synthesis of Mappicines, Camptothecins, and Homocamptothecins
摘要:
Ambient-temperature reactions of electron-rich aryl isonitriles with substituted 6-iodo-N-propargylpyridones in the presence of silver carbonate and palladium acetate produce 11H-indolizino[1,2b]quinolin-9-ones in good to excellent yield. Experimental evidence suggests that the process coccurs though organopalladium rather than radical intermediates. It is applied to synthesis analogues of mappicine and camptothecin, including the silatecans DB-67 and DB-91 (homo-DB-67).
Rational design and synthesis of 1,5-disubstituted tetrazoles as potent inhibitors of the MDM2-p53 interaction
作者:Ewa Surmiak、Constantinos G. Neochoritis、Bogdan Musielak、Aleksandra Twarda-Clapa、Katarzyna Kurpiewska、Grzegorz Dubin、Carlos Camacho、Tad A. Holak、Alexander Dömling
DOI:10.1016/j.ejmech.2016.11.029
日期:2017.1
Using the computational pharmacophore-based ANCHOR.QUERY platform a new scaffold was discovered. Potent compounds evolved inhibiting the protein-protein interaction p53-MDM2. An extensive SAR study was performed based on our four-point pharmacophore model, yielding derivatives with affinity to MDM2 in the nanomolar range. Their binding affinity with MDM2 was evaluated using both fluorescence polarization
hexahydrofuro[3,2-b]pyridine derivatives in moderate to good yields. This straightforward procedure allows to assemble in just two synthetic steps natural product-like compounds having the 2-aza-7-oxabicyclo[4.3.0]nonane framework, displayed by various alkaloids.
An amorphous amide compound of the formula
wherein R is selected from the group consisting of an alkyl group, an aryl group, an alkylaryl group, an arylalkyl group, and combinations thereof. An amorphous diamide compound of the formula
wherein R
1
is selected from the group consisting of an alkylene group, an arylene group, an alkylarylene group, an arylalkylene group, and combinations thereof.
Synthesis of Isonitriles from N-Substituted Formamides Using Triphenylphosphine and Iodine
作者:Qun-Li Luo、Xia Wang、Qing-Gang Wang
DOI:10.1055/s-0034-1379111
日期:——
alkyl and aryl isocyanides. Treatment of N-substituted formamides with the reagent combination of triphenylphosphine and molecular iodine, in the presence of a tertiary amine, quickly produces the corresponding isocyanides in high yields under ambient conditions. The process employs readily available and low-cost reagents, a convenient synthetic procedure, and mild reaction conditions for the synthesis
Development of a stereoselective Ugi reaction starting from an oxanorbornene β-amino acid derivative
作者:Luca Banfi、Andrea Basso、Cinzia Chiappe、Fabio De Moliner、Renata Riva、Lorenzo Sonaglia
DOI:10.1039/c2ob25060h
日期:——
We have synthesised a novel oxanorbornene β-aminoacid derivative and employed it in a stereoselective Ugi reaction. Hypothesis regarding the mechanism taking place during the reaction have been made and validated through the determination of the relative and absolute configuration of the Ugi adducts. Use of the correct choice of solvents can increase stereoselection. The resulting bicyclic peptidomimetics can be used as a novel class of pluripotent substrates to be elaborated according to the synthetic strategies previously elaborated in our laboratories.