Synthesis and Antitumor Activity of Ester-Modified Analogues of Bengamide B
摘要:
Bengamide B, a novel sponge-derived marine natural product with broad spectrum antitumor activity, was not suitable for further preclinical development because of its difficult synthesis and very poor water solubility. Bengamide B produced a 31% T/C at its solubility-limited maximum intravenous dose of 33 micromol/kg in MDA-MB-435 breast carcinoma implanted subcutaneously as a xenograft in nude mice. Compound 8a, a bengamide B analogue with three structural changes (t-Bu alkene substituent, unsubstituted lactam nitrogen, and inverted lactam 5'-myristoyloxy group), was as potent as bengamide B in vitro and more efficacious than bengamide B in vivo. A series of ester-modified analogues based on 8a were synthesized and tested in vitro and in vivo (MDA-MB-435). The cyclohexyl- and phenethyl-substituted esters, 8c and 8g, respectively, had in vitro and in vivo activities similar to that of 8a and enhanced water solubility (ca. 1 mg/mL). Consequently, 8c and 8g were tested in the MDA-MB-435 xenograft model at 100 micromol/kg and produced 29% and 57% tumor regression, respectively.
isolation of [Ca(CH2SiMe3)(thf)3(μ‐Cl)]2. Furthermore, the metathetical approach of reacting [Ca(CH2SiMe3)I(thf)4] with KN(SiMe3)2 and the addition of N,N,N′,N′′,N′′‐pentamethyldiethylenetriamine (pmdeta) allowed the isolation of heteroleptic [CaCH2SiMe3N(SiMe3)2}(pmdeta)]. In the reaction of this derivative with phenylsilane, the trimethylsilylmethyl group proved to be more reactive than the bis
CrCl<sub>2</sub>-Promoted Stereospecific and Stereoselective Alkyl- and Silylcyclopropanation of α,β-Unsaturated Amides
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Méjica、Elena G. Blanco、Santiago García-Granda、M. Rosario Díaz
DOI:10.1021/jo800103t
日期:2008.5.1
An efficient chromium-promoted alkyl- or silylcyclopropanation of α,β-unsaturated amides is described. These reactions can be carried out on (E)- or (Z)-α,β-enamides in which the C−C double bond is di-, or trisubstituted. This process takes place with totalstereospecificity and the new stereogenic center is generated with high or total stereoselectivity. Some synthetic applications of the obtained
The relative reactivities of Zn, Al, and Sm carbenoids in the chemoselective carbene insertion reaction of heaviergroup14hydrides were studied. By variation of the reaction protocols using Sm carbenoids, insertion reaction can favour the Ge-H bonds to give Ge-alkylated derivatives in good to high yield.
A new route for the selective synthesis of [6,6]-methanofullerenes. Electrosynthesis of C61HCMe3 and C61HCN
作者:Pierre L. Boulas、Yuhong Zuo、Luis Echegoyen
DOI:10.1039/cc9960001547
日期:——
A new fast and simple route for the selective synthesis of methanofullerenes that uses the reaction between the C60 dianion and diodo- or dibromo-reagents is described.
[EN] SUBSTITUTED LACTAMS AND THEIR USE AS ANTI-CANCER AGENTS<br/>[FR] LACTAMES SUBSTITUES ET UTILISATION DE CEUX-CI EN TANT QU'AGENTS ANTI-CANCEREUX
申请人:NOVARTIS AG
公开号:WO2005014574A1
公开(公告)日:2005-02-17
This invention relates to certain substituted lactam compounds of the formula (I), particularly caprolactam compounds, which are useful for the treatment of cancer.