selected ferrocene derivatives were determined by X-ray diffraction analysis. The ferrocene derivatives and the ruthenium complexes were tested in vitro for their cytotoxicproperties against three cell lines derived from ovarian cancer (A2780, A2780cis, and SK-OV-3) and against non-tumour embryonic cell line HEK293 (human kidney cells). The most active ferrocene derivatives displayed cytotoxicity in submicromolar
通式的二茂铁衍生物的家族的[Fe(η 5 -C 5 H ^ 4 CH 2(p -C 6 H ^ 4)CH 2(N-HET))2 ]轴承饱和六元和五元N-杂环(N-het)已准备好。所选择的配合物与酸(HCl,乙酸)的反应提供相应的盐酸盐或导致官能化的侧链N-杂环的脱保护。的[茹(η反应6 - p氯-cymene)2 } 2与相应的环戊二烯衍生物,得到的阳离子钌络合物的[Ru(η] 6- p -cymene)(η 5 -C 5 H ^ 4 CH 2(p -C 6 H ^ 4)CH 2(N-HET))]氯而ruthenocenes的[Ru(η 5 -C 5 H ^ 4 CH 2(p - C 6 H 4)CH 2(N-het))2形成副产物。通过元素分析,熔点,NMR和ESI-MS对制备的配合物(20个实施例)进行表征,并通过X射线衍射分析确定所选择的二茂铁衍生物的分子结构。二茂铁衍生物和钌配
A convenient synthetic method for amide oxidation
作者:Gyoonhee Han、Matthias C McIntosh、Steven M Weinreb
DOI:10.1016/s0040-4039(00)78191-3
日期:1994.8
Diazotization of o-aminobenzamides in methanol in the presence of a catalytic amount of CuCl affords α-methoxybenzamides in good yields.
Secondaryamines can be readily oxidized to the corresponding nitrones using urea-hydrogen peroxide complex (UHP) and metal catalysts in methanol at room temperature. Sodium tungstate is the most effective catalyst in several runs and common protecting groups are tolerated in these conditions.
Synthesis of Pyrrolizidine Derivatives by 1,3-Dipolar Cycloaddition Reactions of Chiral Five-Membered Cyclic Azomethine Ylides
作者:Nikolaos G. Argyropoulos、Vasiliki C. Sarli、Maria Gdaniec
DOI:10.1002/ejoc.200600207
日期:2006.8
The 1,3-dipolarcycloadditionreactions of chiralfive-memberedcyclicazomethineylides, generated in situ from ethyl glyoxylate and protected (3S,4S)-dihydroxypyrrolidines 3 and 6 have been studied. The facial selectivity of the cycloadditionreaction is governed by the steric effect of the substituent on the pyrrolidine ring next to the azomethineylide functionality, leading in all cases to an
Exploratory Synthetic Studies of the α-Methoxylation of Amides <i>via</i> Cuprous Ion-Promoted Decomposition of <i>o</i>-Diazobenzamides
作者:Gyoonhee Han、Matthew G. LaPorte、Mathias C. McIntosh、Steven M. Weinreb、Masood Parvez
DOI:10.1021/jo961529a
日期:1996.1.1
A convenient nonelectrochemical amide oxidation method has been developed. The process involves a cuprous ion-promoted decomposition of o-diazobenzamides like 4, generated in situ from the corresponding o-aminobenzamides, to give N-acyliminium ion intermediate 9 via a 1,5-H-atom transfer, followed by metal-catalyzed oxidation of the resulting alpha-amidyl radical. The transformation produces alpha-methoxybenzamides 15 in good yields. An attempt was made to apply this oxidation method to a total synthesis of the alkaloid (-)-anisomycin (16). Scalemic o-aminobenzamide pyrrolidine derivatives 18a/18b underwent oxidation to give a-methoxylated amide substrates 19a/ 19b, respectively, in good yields. However, alkylation of the N-acyliminium intermediate 20 with (p-methoxybenzyl)magnesium chloride gave the undesired anti-compounds 22a/22b as the major products. The amide oxidation exhibits good regioselectivity with many unsymmetrical 2-substituted piperidine and pyrrolidine systems. In general, it appears that the larger the C-2 substituent, the greater the methylene/methine H-atom abstraction ratio. A mechanistic rationale for this selectivity is suggested based upon amide rotamer populations. An extension of this methodology can be used to conduct two sequential amide oxidations using readily prepared 2-amino-6-nitrobenzamides such as 68 and 69.