Expedited Synthesis of Matrine Analogues through an Oxidative Cascade Addition/Double-Cyclization Radical Process
作者:Simón Olguín-Uribe、Marco V. Mijangos、Yoarhy A. Amador-Sánchez、Miguel A. Sánchez-Carmona、Luis D. Miranda
DOI:10.1002/ejoc.201700208
日期:2017.5.3
nicotinate–xanthate derivative to N-allylindoles and N-allylpyrroles resulted in polycyclic heterocycle-fused pyridonaphthyridines through a tandemradical intermolecular/intramolecular oxidative addition reaction sequence that created three new C–C bonds and two new rings in a single event. Such polyheterocycles showcase the matrine alkaloid framework and are similar to indole–monoterpenoid natural products
Synthesis and evaluation of cyclic nitrone derivatives as potential anti-cancer agents
作者:Wei Zhou、Dongyan Ju、Yuhui Ao、Yu Liu、Jinbo Zhao
DOI:10.1007/s00044-021-02729-2
日期:2021.6
However, successful clinical cases of nitrone therapeutics are still lacking. Herein we report the synthesis and antiproliferative activity of a series of structurally diverse nitrone derivatives against a panel of 5 cancer cell lines, based on which indole- and pyrrole-fused were further evaluated by analogue preparation and in-vitro screening. Analogues with moderate to good potency were identified
X=Y-ZH systems as potential 1,3-dipoles. Part 33. Generation of nitrones from oximes. Tandem Michael addition-1,3-dipolar cycloaddition reactions. Class 2 processes in which the dipolarophile is located within the oxime.
corresponding C-alkenyl nitrones which undergo an intramolecular cycloaddition. The cycloaddition can occur by one of two modes leading to either bridged- or fused-isoxazolidines. The latter is preferred in most cases except that of the C-(3-alkenyl) nitrone which gives exclusively the bridged-ring product and the C-(4-alkenyl)nitrones derived from N-allylpyrrole-2-carboxyaldehyde oxime which gives both bridged-
Intramolecular Alkene Aminocarbonylation Using Concerted Cycloadditions of Amino-Isocyanates
作者:Ryan A. Ivanovich、Christian Clavette、Jean-François Vincent-Rocan、Jean-Grégoire Roveda、Serge I. Gorelsky、André M. Beauchemin
DOI:10.1002/chem.201600574
日期:2016.6.1
temperatures (150–200 °C), and issues included competing hydroamination and N‐isocyanate dimerization pathways. Herein, improved conditions for concerted intramolecular alkene aminocarbonylation with N‐isocyanates are reported. The use of βN‐benzyl carbazate precursors allows the effective minimization of N‐isocyanate dimerization. Diminished dimerization leads to higher yields of alkene aminocarbonylation
PIPERAZINE COMPOUND CAPABLE OF INHIBITING PROSTAGLANDIN D SYNTHASE
申请人:Urade Yoshihiro
公开号:US20110319413A1
公开(公告)日:2011-12-29
This invention relates to a piperazine compound represented by Formula (I),
wherein
R
1
is C
1-6
alkyl;
R
2
is hydroxy, C
1-6
alkyl that may have one or more substituents, —(C═O)—N(R
3
)(R
4
), or —(C═O)—OR
5
;
R
3
and R
4
are the same or different, and each represents hydrogen or C
1-6
alkyl that may have one or more substituents, or
R
3
and R
4
, taken together with a nitrogen atom to which R
3
and R
4
are attached, may form a saturated heterocyclic group;
R
5
is hydrogen or C
1-6
alkyl that may have one or more substituents; and
n is 1 or 2;
or a salt thereof.