Novel conformationally constrained pyrazole derivatives as potential anti-cancer agents
作者:Konstantinos M. Kasiotis、Evangelia N. Tzanetou、Dimitrios Stagos、Nikolas Fokialakis、Eleni Koutsotheodorou、Dimitrios Kouretas、Serkos A. Haroutounian
DOI:10.1515/znb-2015-0053
日期:2015.9.1
Abstract The synthesis of 17 novel conformationally constrained pyrazolederivatives is reported herein, along with the assessment of their anti-proliferative and anti-angiogenicactivities. The evaluation of their inhibitory effect on cell proliferation against HepG2, HeLa, and MCF-7 cells revealed the pyrrolo[2,3-g]indazole 23 as a potent inhibitor of cell growth with IC50 values of 5 μm. Additionally
A Novel and Chemoselective Process of<i>N</i>-Alkylation of Aromatic Nitrogen Compounds Using Quaternary Ammonium Salts as Starting Material
作者:Carlos A. González-González、Juan Javier Mejía Vega、Ricardo García Monroy、Davir González-Calderón、David Corona-Becerril、Aydeé Fuentes-Benítes、Joaquín Tamariz Mascarúa、Carlos González-Romero
DOI:10.1155/2017/4586463
日期:——
The process of N-alkylation of several pyrroles, indoles, and derivative heterocycles is herein described, using quaternary ammonium salts as the source of an alkylating agent. These reactions were carried out on several heterocyclic rings with triethylbenzylammonium chloride or tetradecyltrimethylammonium bromide and an NaOH solution at 50%, leading to a chemoselective N-alkylated product and an average
4-Hydroxyindole (1a), a useful intermediate for Pindolol (1b), has been prepared via electrooxidative coupling of 1,3-cyclohexadione with ethyl vinyl ether followed by ammonolysis and dehydrogenation.
Novel cyclohexanone derivatives of general formula: ##STR1## (wherein R.sup.1 is a hydrocarbon group of 1 to 15 carbon atoms) and new cyclohexanone derivatives of general formula: ##STR2## (wherein R.sup.1 and R.sup.2 each is a hydrocarbon group of 1 to 15 carbon atoms) are produced by an electrooxidative coupling of 1,3-cyclohexanedione with a vinyl ether of general formula: CH.sub.2 .dbd.CH-O-R.sup.1 (wherein R.sup.1 is as defined above) in the presence or absence of an alcohol of general formula: R.sup.2 OH (wherein R.sup.2 is as defined above). These new cyclohexanone derivatives can be easily converted to N-substituted or unsubstituted-4-oxo-4,5,6,7-tetrahydroindoles, which are of value as intermediates for the production of N-substituted or unsubstituted-4-hydroxyindoles and, thence, to pindolol and its analogs.
A simple and general synthesis of 4-oxo-4,5,6,7-tetrahydroindoles via a novel intramolecular 1,3-dipolar cycloaddition approach
作者:Darrell R. Hutchison、Naresh K. Nayyar、Michael J. Martinelli
DOI:10.1016/0040-4039(96)00426-1
日期:1996.4
A general synthesis of 4-keto-4,5,6,7-tetrahydroindoles 6–12 has been achieved in two steps using a new intramolecular1,3-dipolarcycloadditionapproach in moderate yields (45–60%). The potential of this methodology is demonstrated by the synthesis of a mitomycin skeleton (15) and a topoisomerase-1 inhibitor skeleton (17).