Rh(I)-Catalyzed Enantioselective Hydrogenation of (E)- and (Z)-β-(Acylamino)acrylates Using 1,4-Bisphosphine Ligands under Mild Conditions
摘要:
[GRAPHICS]Rh-Me-BDPMI (1a) complex can be an effective catalyst for the hydrogenations of (E)- and (2)-beta-(acylamino)acrylates, in which the Zisomers hydrogenated with the same or even higher ee values than the corresponding E-isomers. The conversion yield and enantioselectivity of E-and Z-isomers were largely dependent on the solvent, and thus, the E-isomers were hydrogenated more effectively in CH2Cl2, whereas the Z-isomers were hydrogenated more effectively in polar MeOH solvent.
Rh(I)-Catalyzed Enantioselective Hydrogenation of (E)- and (Z)-β-(Acylamino)acrylates Using 1,4-Bisphosphine Ligands under Mild Conditions
摘要:
[GRAPHICS]Rh-Me-BDPMI (1a) complex can be an effective catalyst for the hydrogenations of (E)- and (2)-beta-(acylamino)acrylates, in which the Zisomers hydrogenated with the same or even higher ee values than the corresponding E-isomers. The conversion yield and enantioselectivity of E-and Z-isomers were largely dependent on the solvent, and thus, the E-isomers were hydrogenated more effectively in CH2Cl2, whereas the Z-isomers were hydrogenated more effectively in polar MeOH solvent.
Iodine‐Promoted One‐pot Synthesis of Highly Substituted 4‐Aminopyrroles and Bis‐4‐aminopyrrole from Aryl Methyl Ketones, Arylamines, and Enamines
作者:Hitesh B. Jalani、Jyotirling R. Mali、Hyejun Park、Jae Kyun Lee、Kiho Lee、Kyeong Lee、Yongseok Choi
DOI:10.1002/adsc.201800899
日期:2018.11.5
functionally diverse and highly substituted 4‐aminopyrroles directly from aryl methyl ketones, arylamines, and enamines was developed. The reaction involves in‐situ oxidation of aryl methyl ketone to glyoxal, subsequent imine formation by aniline, followed by nucleophilic addition of enamine, and cyclization to afford highly substituted 4‐aminopyrroles. This reaction involved the formation of two C−N
Screening of a Novel Fragment Library with Functional Complexity against <i>Mycobacterium tuberculosis</i>
InhA
作者:Federica Prati、Fabio Zuccotto、Daniel Fletcher、Maire A. Convery、Raquel Fernandez-Menendez、Robert Bates、Lourdes Encinas、Jingkun Zeng、Chun-wa Chung、Paco De Dios Anton、Alfonso Mendoza-Losana、Claire Mackenzie、Simon R. Green、Margaret Huggett、David Barros、Paul G. Wyatt、Peter C. Ray
DOI:10.1002/cmdc.201700774
日期:2018.4.6
benefits of including functional group complexity (FGC) within fragments when screeningagainst protein targets such as MycobacteriumtuberculosisInhA. We show that InhAfragment actives with FGC maintained their binding pose during elaboration. Furthermore, weak fragment hits with functional group handles also allowed for facile fragment elaboration to afford novel and potent InhA inhibitors with good
From Triazoles to Imidazolines through the Sequential N–H Insertion of α-Imino Rhodium–Carbenes into β-Enamino Esters/Enamine–Imine Tautomerization/Conjugate Addition Cascade
作者:Hyun Ji Jeon、Da Jung Jung、Ju Hyun Kim、Youngmee Kim、Jean Bouffard、Sang-gi Lee
DOI:10.1021/jo501785d
日期:2014.10.17
A rhodium(II)-catalyzed denitrogenative coupling of N-sulfonyl-1,2,3-triazoles with ambiphilic beta-enamino esters affords 2,5-dihydro-H-1-imidazoles (3-imidazolines) with broad functional group tolerance. Mechanistic studies using a deuterium-labeled triazole suggest that the reaction proceeds in a cascade through the N-H insertion of an alpha-imino rhodium-carbene, followed by enamine-imine tautomerization and conjugate addition. Moreover, the reaction proceeds with high diastereoselectivity for alpha-substituted beta-enamino esters (R-3 = Me, Ph) to give a single diastereomer.
Structure activity relationships of 4-hydroxy-2-pyridones: A novel class of antituberculosis agents
作者:Pearly Shuyi Ng、Ujjini H. Manjunatha、Srinivasa P.S. Rao、Luis R. Camacho、Ngai Ling Ma、Maxime Herve、Christian G. Noble、Anne Goh、Stefan Peukert、Thierry T. Diagana、Paul W. Smith、Ravinder Reddy Kondreddi
DOI:10.1016/j.ejmech.2015.10.008
日期:2015.12
Pyridone 1 was identified from a high-throughput cell-based phenotypic screen against Mycobacterium tuberculosis (Mtb) including multi-drug resistant tuberculosis (MDR-TB) as a novel anti-TB agent and subsequently optimized series using cell-based Mtb assay. Preliminary structure activity relationship on the isobutyl group with higher cycloalkyl groups at 6-position of pyridone ring has enabled us to significant improvement of potency against Mtb. The lead compound 30j, a dimethylcyclohexyl group on the 6-position of the pyridone, displayed desirable in vitro potency against both drug sensitive and multi-drug resistant TB clinical isolates. In addition, 30j displayed favorable oral pharmacokinetic properties and demonstrated in vivo efficacy in mouse model. These results emphasize the importance of 4-hydroxy-2-pyridones as a new chemotype and further optimization of properties to treat MDR-TB. (C) 2015 Elsevier Masson SAS. All rights reserved.
Lukes,R.; Kloubek,J., Collection of Czechoslovak Chemical Communications, 1960, vol. 25, p. 607 - 609