Diagnostic or therapeutic somatostatin or bombesin analog conjugates and uses thereof
申请人:Coy H. David
公开号:US20050070470A1
公开(公告)日:2005-03-31
Disclosed are peptide agents and uses thereof that are analogs of biologically active peptides such as somatostatin and bombesin. The compounds of the invention have the general formula X-Y-Z-Q, where X is a cytotoxic agent, therapeutic agent, detectable label or chelating group, and Q is a biologically active peptide. In peptide agents of the invention Y is optionally a hydrophilic polymer or peptide, and Z is a linking peptide bonded to Q at the amino terminus of Q, having two, three, four, or five, amino acid residues selected to link X to Q, while retaining the biological activity of Q. Methods of using these peptide agents in the diagnosis and treatment of diseases are also disclosed.
Directed Hydrogenations and an Ireland-Claisen Rearrangement Linked to Evans-Tishchenko Chemistry: The Highly Efficient Total Synthesis of the Marine Cyclodepsipeptide Doliculide
作者:Tao Chen、Karl-Heinz Altmann
DOI:10.1002/chem.201501252
日期:2015.6.1
Two new convergent total syntheses have been developed for the cytotoxic, actin microfilament‐stabilizing marinecyclodepsipeptide doliculide (1). A key strategic element of both routes is the establishment of the central stereogenic center of the characteristic polydeoxypropionate stereotriad by means of a hydroxyl‐directed catalytic hydrogenation of a trisubstituted double bond. The requisite olefin
Divergent Solid-Phase Synthesis of Natural Product-Inspired Bipartite Cyclodepsipeptides: Total Synthesis of Seragamide A
作者:Hans-Dieter Arndt、Stefano Rizzo、Christina Nöcker、Vijay N. Wakchaure、Lech-Gustav Milroy、Vanessa Bieker、Abram Calderon、Tuyen T. N. Tran、Silke Brand、Leif Dehmelt、Herbert Waldmann
DOI:10.1002/chem.201500368
日期:2015.3.27
natural products (NPs) and analogues thereof often show high affinity, selectivity, and metabolic stability, and methods for the synthesis of NP‐like macrocycle collections are of major current interest. We report an efficient solid‐phase/cyclorelease method for the synthesis of a collection of macrocyclic depsipeptides with bipartite peptide/polyketide structure inspired by the very potent F‐actin stabilizing
The synthetic and biological studies of discorhabdins and related compounds
作者:Yasufumi Wada、Yu Harayama、Daigo Kamimura、Masako Yoshida、Tomoyuki Shibata、Kousaku Fujiwara、Koji Morimoto、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1039/c1ob05058c
日期:——
Various analogues of the marine alkaloids, discorhabdins, have been synthesized. The strategy contains spirocyclization with phenyliodine(III) bis(trifluoroacetate) (PIFA), oxidative fragmentation of the β-amino alcohols with the hypervalent iodine reagent C6F5I(OCOCF3)2, the detosylation and dehydrogenation reaction of the pyrroloiminoquinone unit in the presence of a catalytic amount of NaN3 and
已经合成了海洋生物碱的各种类似物discorhabdins。该策略包含螺环化苯碘(III)双(三氟乙酸盐) (PIFA), β-氨基 高价酒精碘 试剂 C 6 F 5 I(OCOCF 3)2的脱甲苯基化和脱氢反应 吡咯亚氨基醌 催化量的 NaN 3 和桥接醚合成 溴化氢–醋酸作为关键反应。所有合成的化合物通过评价在体外MTT 对人结肠癌细胞系的细胞毒活性试验 HCT-116。此外,discorhabdin A氧杂 还评估了类似物是否针对四种肿瘤模型细胞,即人结肠癌细胞系(威德),是人类前列腺癌细胞系(DU-145)和鼠白血病细胞系(P388和 L1210)。为了鉴定目标,discorhabdin A和discorhabdin A氧杂 类似物由 肝癌专门小组分析。在测试中,discorhabdins对肿瘤细胞可能具有新的作用方式。
Synthesis of the polyketide section of seragamide A and related cyclodepsipeptides via Negishi cross coupling
作者:Jan Hendrik Lang、Thomas Lindel
DOI:10.3762/bjoc.15.53
日期:——
The synthesis of the polyketide section present in the potently cytotoxic marine cyclodepsipeptide jasplakinolide and related natural products, geodiamolides and seragamides, is reported. The key step is a Negishi cross coupling of (R)-(3-methoxy-2-methyl-3-oxopropyl)zinc(II) bromide and an (E)-iodoalkene that was synthesized via an aluminium ester enolate attack at (R)-propylene oxide. The overall