Diarylstrylquinoline diacids and pharmaceutical compositions thereof
申请人:Merck Frosst Canada, Inc.
公开号:US05104882A1
公开(公告)日:1992-04-14
Compounds having the formula: ##STR1## are leukotriene antagonists and inhibitors of leukotriene biosynthesis. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory, and cytoprotective agents.
compounds. In general, the reduction of esters constitutes the most straightforward preparation of ethers. Unfortunately, this transformation requires large amounts of metal hydrides. Presented herein is a bifunctional catalyst system, consisting of Ru/phosphine complex and aluminum triflate, which allows selective synthesis of ethers by hydrogenation of esters or carboxylic acids. Different lactones
Syntheses and biological evaluation of vinblastine congeners
作者:Martin E. Kuehne、William G. Bornmann、Istvan Markó、Yong Qin、Karen L. LeBoulluec、Deborah A. Frasier、Feng Xu、Tshilundu Mulamba、Carol L. Ensinger、Linda S. Borman、Anne E. Huot、Christopher Exon、Fred T. Bizzarro、Julia B. Cheung、Susan L. Bane
DOI:10.1039/b209990j
日期:——
Sixty-two congeners of vinblastine (VLB), primarily with modifications of the piperidine ring in the carbomethoxycleavamine moiety of the binary alkaloid, were synthesized and evaluated for cytotoxicity against murine L1210 leukemia and RCC-2 rat colon cancer cells, and for their ability to inhibit polymerization of microtubular protein at <10−6 M, and for induction of spiralization of microtubular protein, and for microtubular disassembly at 10−4 M concentrations. An ID50 range of >107 M concentrations was found for L1210 inhibition by these compounds, with the most active 1000× as potent as vinblastine.
acceleration effect of an allylic hydroxy group on ring-closing enyne metathesis has been found. Ring-closing enyne metathesis of terminalalkynes possessing an allylic hydroxy group proceeded smoothly without the ethylene atmosphere generally necessary to promote the reaction. The synthesis of (+)-isofagomine with the aid of this efficient reaction has been demonstrated. Mechanistic studies of the acceleration
Catalytic One-Pot Synthesis of Cyclic Amidines by Virtue of Tandem Reactions Involving Intramolecular Hydroamination under Mild Conditions
作者:Sukbok Chang、Minjae Lee、Doo Young Jung、Eun Jeong Yoo、Seung Hwan Cho、Sun Kyu Han
DOI:10.1021/ja064788i
日期:2006.9.1
A newsynthetic methodology for the generation of cyclic amidines has been developed by the reaction of 1,n-aminoalkynes with electron-deficient azides using a ruthenium catalyst at ambient temperature. The reaction proceeds most likely via a tandem sequence of intramolecular hydroamination of aminoalkynes, cycloaddition of azides with the resulting enamines, and rearrangement of triazoline intermediates