36669-06-4Relevant academic research and scientific papers
Tetramethyl 3,7-Dihydroxybicyclonona-2,6-diene-2,4,6,8-tetracarboxylate: A Useful Companion to Meerwein's Ester. Topological Analysis of Bicyclononane Synthesis
Bertz, Steven H.
, p. 3585 - 3592 (1985)
The pH dependence of the condensation of dimethyl 3-oxoglutarate and malondialdehyde to produce 2,6-bis(methoxycarbonyl)phenol and tetramethyl 3,7-dihydroxybicyclonona-2,6-diene-2,4,6,8-tetracarboxylate has been studied in detail: the yield of the former is maximal at pH 4,5, the latter at pH 7.5.The hydrolysis-decarboxylation of the latter provides a convenient route to bicyclononane-3,7-dione.The mechanism proposed for this reaction of malonodialdehyde is also relevant to the chemistry of glyoxal and dimethyl 3-oxoglutarate.The retrosynthetic analysis of the bicyclononane skeleton is considered from a topological perspective.
Functionalized hydrazide macrocycle ion channels showing pH-sensitive ion selectivities
Xin, Pengyang,Tan, Si,Wang, Yaodong,Sun, Yonghui,Wang, Yan,Xu, Yuqing,Chen, Chang-Po
, p. 625 - 628 (2017)
Transmembrane channels formed by functionalized hydrazide macrocycles are reported. The different pH values of buffer solutions have a significant effect on the K+/Cl- selectivity of the macrocycles. This unique transport behavior is
Enhancement of the carbamate activation rate enabled syntheses of tetracyclic benzolactams: 8-oxoberbines and their 5- And 7-membered C-ring homologues
Kurouchi, Hiroaki
supporting information, p. 653 - 658 (2021/02/06)
A route to the direct amidation of aromatic-ring-tetheredN-carbamoyl tetrahydroisoquinoline substrates was developed. This route enabled general access to 8-oxoberberines and their 5- and 7- membered C-ring homologues. It overcomes the undesired tandem side-reactions that result in the destruction of the isoquinoline backbone, which inevitably occurred under our previously reported superacidic carbamate activation method.
Multinuclear non-heme iron complexes for double-strand DNA cleavage
Megens, Rik P.,Van Den Berg, Tieme A.,De Bruijn, A. Dowine,Feringa, Ben L.,Roelfes, Gerard
supporting information; experimental part, p. 1723 - 1733 (2009/10/06)
The cytotoxicity of the antitumor drug BLM is believed to be related to the ability of the corresponding iron complex (Fe-BLM) to engage in oxidative double-strand DNA cleavage. The iron complex of the ligand N4Py (Fe-N4Py; N4Py = N,N-bis(2-pyridyl)-N-bis
Labile linkage for compound delivery to a cell
-
Page/Page column 7, (2010/02/11)
Described are ortho carboxy phenol derived acetals and compositions containing ortho carboxy phenol derived acetals which are useful for delivering biologically active compounds to cells. The acetals can be used to reversibly link up to three different mo
BENZAMIDINE DERIVATIVES
-
, (2008/06/13)
Benzamidine derivatives of formula (I) or pharmaceutically acceptable salts thereof exhibit excellent inhibitory activity against factor Xa and are useful for treating or preventing blood coagulation disorders: wherein R 1represents a hydrogen atom, a halogen atom, an alkyl group or a hydroxyl group; R 2represents a hydrogen atom, a halogen atom or an alkyl group, R 3represents a hydrogen atom, an optionally substituted alkyl group, an aralkyl group, an optionally substituted alkanoyl group or an optionally substituted alkylsulfonyl group, R 4and R 5 are the same as or different from each other and each represent a hydrogen atom, a halogen atom, an optionally substituted alkyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group or an optionally substituted carbamoyl group, and R 6represents a substituted pyrrolidine group or substituted piperidine group.
Protected nucleoside and method for its synthesis
-
, (2008/06/13)
The present invention relates to a nucleoside having the formula: STR1 where R1 is a hydrogen or a protecting group; R2 is a hydrogen or a coupling group; R3 and R4 are each either a hydrogen or an alkyl group, where R3 and R4 can be connected in a ring; R5 is a hydrogen, an alkyl group, or a carboxylic ester group; R6 is a hydrogen, an alkyl group, or a carboxylic ester group; R7 is a hydrogen, a nitro group, a halogen, a cyano group, or an alkyl group, where R7 is attached at either position 4, 5 or 6; and Base is a protected heterocyclic base. Further, the present invention relates to a method of making the nucleoside and a method of oligomer synthesis utilizing the nucleoside.
A Convenient One-Pot Method for the Construction of Tetrasubstituted Phenols through a Michael Addition-Aldol Cyclization Sequence
Covarrubias-Zu?n?iga, Adria?n,Ri?os-Barrios, Eduardo
, p. 5688 - 5689 (2007/10/03)
The sodium salt of dimethyl 1,3-acetonedicarboxylate (1) readily reacts with certain alkynals under mild conditions in THF to give a tetrasubstituted aromatic ring with regiocontrol at the metaposition through a Michael addition-aldol cyclization sequence. Thus the reaction of I with propynal, 2-butynal, 2-pentynal, 2-octynal, 4-(benzoyloxy)-2-butynal, and 4-((tetrahydropyranyl)-oxy)-2-butynal at 25 °C gave the following products: dimethyl 2-hydroxybenzene-1,3-dicarboxylate (11percent), dimethyl 2-hydroxy-4-methylbenzene-1,3-dicarboxylate (45percent), dimethyl 4-ethyl-2-hydroxybenzene-1,3-dicarboxylate (46percent), dimethyl 2-hydroxy-4-pentylbenzene-1,3-dicarboxylate (42percent), dimethyl 2-hydroxy-4-((pivaloyloxy)methyl)benzene-1,3-dicarboxylate (88percent), dimethyl 2-hydroxy-4-((benzoyloxy)methyl)benzene-1,3-dicarboxylate (74percent), and dimethyl 2-hydroxy-4-(((tetrahydropyranyl)oxy)methyl)benzene-1,3-dicarboxylate (70percent).
Metal Ion Catalysis by Blocking Inhibitory Reverse Paths in the Hydrolysis of 3-Carboxyaspirin
Suh, Junghun,Chun, Keun Ho
, p. 3057 - 3063 (2007/10/02)
The hydrolysis of 3-carboxyaspirin (1) was kinetically investigated in the presence or absence of tri- or divalent metal ions.The spontaneous hydrolysis of the neutral and the monoanionic forms of 1 involves anhydride intermediates formed by the nucleophi
A New Aromatic Annelation Reaction with Two Synthons, Enaminones and 3-Oxoglutarate. Studies on the β-Carbonyl Compounds Connected with β-Polyketides. VIII
Takeuchi, Naoki,Okada, Naomi,Tobinaga, Seisho
, p. 4355 - 4359 (2007/10/02)
Reactions of the enaminones 1 with dimethyl 3-oxoglutarate in the presence of KF-AcOH or AcONa-AcOH and 18-crown-6 gave the dimethyl 2-hydroxy-1,3-benzenedicarboxylates 3, providing a new aromatic annelation reaction.Keywords - enaminone; dimethyl 3-oxoglutarate; buffer catalysis; aromatic annelation; dimethyl 2-hydroxy-1,3-benzenedicarboxylate
