C5′-Alkyl Substitution Effects on Digitoxigenin α-l-Glycoside Cancer Cytotoxicity
摘要:
A highly regio- and stereoselective asymmetric synthesis of various CS'-alkyl side chains of rhamnosyl- and amicetosyl-digitoxigenin analogues has been established via palladium-catalyzed glycosylation with postglycosylated dihydroxylation or diimide reduction. The C5'-methyl group in both alpha-L-rhamnose and cc-L-amicetose digitoxin analogues displayed a steric directed apoptosis induction and tumor growth inhibition against nonsmall cell human lung cancer cells (NCI-H460). The antitumor activity is significantly reduced when the steric hindrance is increased at the C5'-stereocenter.
作者:Daniel Thiel、Fabian Blume、Christina Jäger、Jan Deska
DOI:10.1002/ejoc.201800333
日期:2018.6.7
HUOM! TAMA MANUSKA ON TILASSA CLOSED KUNNES ARTIKKELI ON JULKAISTU JA JULKAISUVIIVE MAARITELTY KUSTANTAJAN JULKAISUPAIVASTA ALKAEN. The manuscript is "closed" until the article has been published and the embargo date can be defined.
呼!蒂拉萨岛上的 TAMA MANUSKA 关闭了 JULKAISTU JA JULKAISUVIIVE MAARITELTY KUSTANTAJAN JULKAISUPAIVASTA ALKAEN 的 KUNNES ARTIKKELI。在文章发表并且可以确定禁运日期之前,手稿处于“关闭”状态。
Ruthenium-catalyzed hydrogenation of aromatic ketones using chiral diamine and monodentate achiral phosphine ligands
作者:Mengna Wang、Ling Zhang、Hao Sun、Qian Chen、Jian Jiang、Linlin Li、Lin Zhang、Li Li、Chun Li
DOI:10.1016/j.catcom.2021.106303
日期:2021.6
The Ru-catalyzed asymmetric hydrogenation of ketones with chiral diamine and monodentate achiral phosphine has been developed. A wide range of ketones were hydrogenated to afford the corresponding chiral secondary alcohols in good to excellent enantioselectivities (up to 98.1% ee). In addition, an appropriate mechanism for the asymmetric hydrogenation was proposed and verified by NMR spectroscopy.
A Concise Synthesis of (S)-(+)-Ginnol Based on Catalytic Enantioselective Addition of Commercially Unavailable Di(n-alkyl)zinc to Aldehydes and Ketones
作者:Kazuaki Ishihara、Manabu Hatano、Tomokazu Mizuno
DOI:10.1055/s-0030-1258129
日期:2010.8
Catalytic, enantioselective n-alkyl addition of commercially unavailable di(n-alkyl)zinc reagents, which were prepared by a refined version of Charette's procedure with Grignard reagents, to aldehydes and ketones was developed. To minimize the side reactions in the catalysis by chiral phosphoramide ligand (1) or 3,3'-diphosphoryl-BINOL ligand (2), a preparation of di(n-alkyl)zinc reagents with a 1:2
Cinchona-Alkaloid-Derived NNP Ligand for Iridium-Catalyzed Asymmetric Hydrogenation of Ketones
作者:Lin Zhang、Ling Zhang、Qian Chen、Linlin Li、Jian Jiang、Hao Sun、Chong Zhao、Yuanyong Yang、Chun Li
DOI:10.1021/acs.orglett.1c04101
日期:2022.1.14
Most ligands applied for asymmetrichydrogenation are synthesized via multistep reactions with expensive chemical reagents. Herein, a series of novel and easily accessed cinchona-alkaloid-based NNP ligands have been developed in two steps. By combining [Ir(COD)Cl]2, 39 ketones including aromatic, heteroaryl, and alkyl ketones have been hydrogenated, all affording valuable chiral alcohols with 96.0–99
大多数用于不对称氢化的配体是通过与昂贵的化学试剂的多步反应合成的。在此,一系列新颖且易于获取的基于金鸡纳生物碱的 NNP 配体已分两步开发。通过结合 [Ir(COD)Cl] 2,包括芳族酮、杂芳基酮和烷基酮在内的 39 种酮被氢化,均能提供有价值的手性醇,其 ee 为 96.0–99.9%。通过NMR、HRMS和DFT讨论了合理的反应机理,并验证了涉及三氢化物的活化模型。
C5′-Alkyl Substitution Effects on Digitoxigenin α-<scp>l</scp>-Glycoside Cancer Cytotoxicity
作者:Hua-Yu Leo Wang、Bulan Wu、Qi Zhang、Sang-Woo Kang、Yon Rojanasakul、George A. O’Doherty
DOI:10.1021/ml100291n
日期:2011.4.14
A highly regio- and stereoselective asymmetric synthesis of various CS'-alkyl side chains of rhamnosyl- and amicetosyl-digitoxigenin analogues has been established via palladium-catalyzed glycosylation with postglycosylated dihydroxylation or diimide reduction. The C5'-methyl group in both alpha-L-rhamnose and cc-L-amicetose digitoxin analogues displayed a steric directed apoptosis induction and tumor growth inhibition against nonsmall cell human lung cancer cells (NCI-H460). The antitumor activity is significantly reduced when the steric hindrance is increased at the C5'-stereocenter.