Chemistry of renieramycins. Part 6: Transformation of renieramycin M into jorumycin and renieramycin J including oxidative degradation products, mimosamycin, renierone, and renierol acetate
摘要:
The transformation of remeramycin M (1m) into renieramycin J (1j) and jorumycin (2) is presented along with the results of antiproliferative assay data. The chemical stability and the oxidative degradation of 2 and renieramycm E (1e) to generate simple isoquinoline alkaloids, such as mimosamycin (7), renierol acetate (12), and renierone (8) are also described. (C) 2004 Elsevier Ltd. All rights reserved.
regioselective introduction of a chloromethyl group at C-6 and a methoxycarbonylmethyl group at C-5 and subsequent reaction of the intermediate methyl (o-(chloromethyl)phenyl)acetate derivative 16 with methylamine. Oxidation of the 5,7,8-trimethoxy-2,6-dimethyl-1, 4-dihydroisoquinoline-3(2H)-one 17 thus obtained, using cerium(IV) ammonium nitrate as a selective oxidizing agent, gave mimosamycin (1) in good overall
Chemistry of Antitumor Isoquinoline-quinone Alkaloids: Unexpected Oxidative Degradation of Saframycin S to Generate Simple Isoquinoline Alkaloids, Mimosamycin and Mimocin
Saframycin S, prepared by treating saframycin A with silver nitrate in aqueous acetonitrile, was transformed into simple isoquinolinequinones, mimosamycin and mimocin, by treatment with a catalytic amount of trifluoroacetic acid (TFA) in chloroform. The proposed mechanism for this oxidative degradation is presented.
用硝酸银在乙腈水溶液中处理 saframycin A 制备的 Saframycin S 通过在氯仿中用催化量的三氟乙酸 (TFA) 处理转化为简单的异喹啉醌、含羞草霉素和 mimocin。提出了这种氧化降解的拟议机制。
Cribrostatins 1 and 2
申请人:ARIZONA BOARD OF REGENTS
公开号:EP0528615A1
公开(公告)日:1993-02-24
The blue marine sponge Cribrochalina sp., collected in the Republic of the Maldives, was found to contain the new cell growth inhibitory isoquinolinequinones designated cribrostatin 1 (8.8 x 10⁻⁶% yield) and 2 (3.1 x 10¹⁶% yield) which are active against the P388 lymphocytic leukemia cell line (PS ED₅₀ 1.58 µg/mL, PS ED₅₀ 2.73 µg/mL, respectively). Importantly, both cribrostatins 1 and 2 have shown selective activity against all of the nine human melanoma cell lines employed by the U.S. National Cancer Institute. Structural determinations of both substances were accomplished utilizing high field NMR (400 MHz) and mass spectral studies. Confirmation of the cribrostatin 1 structure was achieved by X-ray crystallographic techniques.
The present invention relates (i) to conjugate peptides engineered to noncovalently bind to heat shock proteins; (ii) to compositions comprising such conjugate peptides, optionally bound to heat shock protein; and (iii) to methods of using such compositions to induce an immune response tin a subject in need of such treatment. It is based, at least in part, on the discovery of tethering molecules which may be used to non-covalently link antigenic peptides to heat shock proteins. The present invention also provides for methods of identifying additional tethers which may be comprised, togethter with antigenic sequences, in conjugate peptides.
Modulation of heat-shock-protein-based immunotherapies
申请人:——
公开号:US20040071656A1
公开(公告)日:2004-04-15
Methods and compositions are provided for modulating the immune response to an antigen based upon the finding that the cell surface protein CD40 is a mammalian heat shock protein (hsp) receptor. Cell surface CD40 mediates the binding, cell signaling, and uptake of hsp and particularly hsp with antigen bound thereto. Methods are provided for modulating hsp-antigen uptake and an immune response to the antigen by altering CD40 expression, as well as utilizing CD40-binding fragments of mammalian hsp and muteins thereof for targeting antigens to CD40-expressing cells. Screening methods for agonists and antagonists of the CD40-hsp interaction are also provided.