Antitumor agents 287. Substituted 4-amino-2H-pyran-2-one (APO) analogs reveal a new scaffold from neo-tanshinlactone with in vitro anticancer activity
摘要:
4-Amino-2H-benzo[h] chromen-2-one (ABO) and 4-amino-7,8,9,10-tetrahydro-2H-benzo[h] chromen-2-one (ATBO) analogs were found to be significant in vitro anticancer agents in our previous research. Our continuing study has now discovered a new simplified (monocyclic rather than tricyclic) class of cytotoxic agents, 4-amino-2H-pyran-2-one (APO) analogs. By incorporating various substituents on the pyranone ring, we have established preliminary structure-activity relationships (SAR). Analogs 19, 20, 23, and 26-30 displayed significant tumor cell growth inhibitory activity in vitro. The most active compound 27 exhibited ED50 values of 0.059-0.090 mu M. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of Tetrahydropyran-4-ones from Dioxinones Catalyzed by Scandium(III) Triflate
作者:William J. Morris、Daniel W. Custar、Karl A. Scheidt
DOI:10.1021/ol050093v
日期:2005.3.1
[reaction: see text] A scandium triflatecatalyzed, diastereoselective cyclization between aldehydes and beta-hydroxy dioxinones has been discovered. This process capitalizes on the untapped nucleophilicity of the embedded enol ether within the dioxinone core. The bicyclic compounds from the resulting cyclization can be isolated, or alternatively, alkoxide nucleophiles can be directly added. This in
Vinylogous Mukaiyama-aldol reaction was realized by use of dioxinone-derived silyl dienolethers and various aldehydes in the presence of highly catalytic amounts of bismuth triflate. The reaction proceeds rapidly and affords the corresponding β-hydroxy-1,3-dioxin-4-ones in very good to excellent yields (up to 98%).
Bi(OTf)<sub>3</sub>-promoted cascade annulation of hydroxy-pyranones and unsaturated γ-ketoesters for the construction of polycyclic bridged pyrano-furopyranones
作者:Akshay B. Rathod、Balasaheb R. Borade、Pooja I. Sambherao、Ravindar Kontham
DOI:10.1039/d3ob01862h
日期:——
three dimensional polycyclic bridged chromano-furopyranones and pyrano-furopyranones (closely related to bioactive natural products) via bismuth(III)-catalyzed cascade annulation of hydroxy-pyranones and unsaturated γ-ketoesters is presented. This process involves intermolecular Michael addition, intramolecular hemiketalization, lactonization, formation of one C–C bond and two C–O bonds, rings, and contiguous
提出了一种通过铋( III )催化羟基吡喃酮和不饱和γ-酮酯的级联环化构建复杂三维多环桥联色并呋喃并吡喃酮和吡喃并呋喃吡喃酮(与生物活性天然产物密切相关)的有效方案。这一过程涉及分子间迈克尔加成、分子内半缩酮化、内酯化、形成一个 C-C 键和两个 C-O 键、环和连续的立体中心。
Highly Stereoselective Brønsted Acid Catalyzed Synthesis of Spirooxindole Pyrans
作者:Jingqi Wang、Erika A. Crane、Karl A. Scheidt
DOI:10.1021/ol200987c
日期:2011.6.17
A Bronsted acid-catalyzed Prins-type cyclization sequence to construct spirooxindole pyrans in high yields and excellent diastereoselectivity has been developed. The combination of a beta-hydroxy dioxinone fragment and isatin dimethyl acetal generate oxa-spirooxindoles efficiently. These compounds are diversifiable scaffolds that tap into the rich chemistry of dioxinones.