A protocol of iridium catalyzed asymmetrichydrogenation of 4-alkyl substituted 3-ethoxycarbonyl quinolin-2-ones and coumarins has been reported, providing a wide range of chiral dihydroquinolin-2-ones and dihydrocoumarins in high yields with excellent enantioselectivities (up to 99% ee) and high turnover numbers (up to 28 000). This efficient protocol was successfully applied for the synthesis of
N‐diethylarylamide using CIPE‐assisted α‐silyl carbanions (CIPE=complex‐inducedproximityeffect) has been developed using a simple reagent combination of LDA (lithium diisopropylamide) and chlorosilane. A study of the mechanism, and the application of the procedure to an anionic Snieckus–Fries rearrangement for a highly efficient synthesis of the potent phosphatidylinositol 3‐kinase (PI3K) inhibitor LY294002
alkylation of aminophenols to enantiopure tertiary aminophenols, which are useful chiral ligands for metal-catalysed asymmetric reactions, is reported. This very simple synthetic methodology, through reduction or alkylation of an intermediate benzoxazine, was performed in mild conditions, suitable for the conservation of the configuration of the stereogenic centres. Some crystalline aminophenols show the
Structure-Activity Relationships of Novel Salicylaldehyde Isonicotinoyl Hydrazone (SIH) Analogs: Iron Chelation, Anti-Oxidant and Cytotoxic Properties
作者:Eliška Potůčková、Kateřina Hrušková、Jan Bureš、Petra Kovaříková、Iva A. Špirková、Kateřina Pravdíková、Lucie Kolbabová、Tereza Hergeselová、Pavlína Hašková、Hana Jansová、Miloslav Macháček、Anna Jirkovská、Vera Richardson、Darius J. R. Lane、Danuta S. Kalinowski、Des R. Richardson、Kateřina Vávrová、Tomáš Šimůnek
DOI:10.1371/journal.pone.0112059
日期:——
Salicylaldehyde isonicotinoylhydrazone (SIH) is a lipophilic, tridentate iron chelator with marked anti-oxidant and modest cytotoxic activity against neoplastic cells. However, it has poor stability in an aqueous environment due to the rapid hydrolysis of its hydrazone bond. In this study, we synthesized a series of new SIH analogs (based on previously described aromatic ketones with improved hydrolytic
Synthesis of 2,3-Disubstituted Benzofurans from<i>ortho</i>-Acylphenols
作者:Jinsung Tae、Kwang-Ok Kim
DOI:10.1055/s-2004-834951
日期:——
2,3-Disubstituted benzofuran derivatives were synthesized from ortho-acylphenols in two steps. The β-aryloxyacrylates prepared from the ortho-acylphenols were treated with n-Bu3SnH/AIBN and then with 5% HCl-EtOH to afford 2,3-disubstituted benzofurans.