Silica Gel as a Promoter of Sequential Aza-Michael/Michael Reactions of Amines and Propiolic Esters: Solvent- and Metal-Free Synthesis of Polyfunctionalized Conjugated Dienes
and solvent‐free silica‐gel‐promoted synthesis of functionalized conjugated dienes by sequential aza‐Michael/Michael reactions by starting from commercially available primary amines and propiolic esters. The scope and usefulness of the method is demonstrated for 31 examples, including a range of propiolic esters, aliphatic amines, and differently substituted aromatic amines. For aliphatic amines, the
The present invention relates to a probe for iFRET and use thereof. Specifically, the present invention relates to a novel probe for iFRET, a method for preparing the probe for iFRET, a method for searching a target protein-specific binding site or a molecule having the binding site using the probe for iFRET, and a method for imaging the target protein using the probe for iFRET. The probe for iFRET according to the present invention utilizes an amino acid in a protein as a fluorescent donor, unlike the conventional FRET method. Therefore, only one fluorescent material is used, and its emission wavelength is distinct from the intrinsic fluorescence of the protein. Thus, high specificity and sensitivity are ensured, and the quantity, activity and mechanism of various proteins can be analyzed in an easy and accurate manner.
Synthesis of Indolequinones from Bromoquinones and Enamines Mediated by Cu(OAc)<sub>2</sub>·H<sub>2</sub>O
作者:Martyn Inman、Christopher J. Moody
DOI:10.1021/jo101071c
日期:2010.9.3
A Cu(II)-mediated synthesis of indolequinones from the corresponding bromoquinones and enamines is reported. The key oxidative cyclization proceeds in good yield for a broad range of substrates and can be performed on a multigram scale, allowing access to biologically interesting structures.
Design and synthesis of methyl 2-methyl-7,7-dihalo-5-phenyl-2-azabicyclo[4.1.0]hept-3-ene-4-carboxylates with calcium channel antagonist activity
作者:Javid S Mojarrad、Ramin Miri、Edward E Knaus
DOI:10.1016/j.bmc.2004.03.063
日期:2004.6
A group of methyl 2-methyl-7,7-dihalo-5-(substituted-phenyl)-2-azabicyclo[4.1.0]hept-3-ene-4-carboxylates were prepared by reaction of dihalocarbenes (:CX2, X = Br, Cl) with methyl 1-methyl-4-(substituted-phenyl)-1,4-dihydropyridine-3-carboxylates. In vitro calcium channel antagonist activities were determined using a guinea pig ileum longitudinal smooth muscle assay. The title compounds exhibited weaker CC antagonist activity (10(-5)-10(-6) M range) than the reference drug nifedipine (1.4 x 10(-8) M). Structure-activity relationship studies showed that the position of a nitro substituent on the C-5 phenyl ring where the relative potency order was ortho > meta > para, and the size and/or electronegativity of the C-7 geminal-dihalo substituents (Br > Cl), were determinants of calcium channel antagonist activity. This class of compounds did not exhibit any inotropic effect on guinea pig left atria. A dihalocyclopropyl moiety is a potential bioisostere for the 2-methyl-3-methoxycarbonylvinyl moiety present in the calcium channel antagonist nifedipine. (C) 2004 Elsevier Ltd. All rights reserved.
Antonow; Berlin, Zhurnal Obshchei Khimii, 1959, vol. 29, p. 4003,4006; engl. Ausg. S. 3962, 3964