16466-61-8Relevant articles and documents
Synthesis of Diprotected Monosubstituted Hydrazine Derivatives from tert-Butyl Carbazates and Boronic Acids
Kabalka, George W.,Guchhait, Sankar K.
, p. 4129 - 4131 (2003)
(Equation presented) Diprotected monosubstituted hydrazine derivatives have been prepared via the reaction of tert-butyl carbazates with boronic acids catalyzed by cuprous chloride at room temperature.
A Modular Approach to Arylazo-1,2,3-triazole Photoswitches
Olson, David E.,Tombari, Robert J.,Tuck, Jeremy R.,Yardeny, Noah
, p. 4305 - 4310 (2021)
Azoheteroarenes make up an emerging class of photoswitchable compounds with unique photophysical properties and advantages over traditional azobenzenes. Therefore, methods for synthesizing azoheteroarenes are highly desirable. Here, we utilize azide-alkyne click chemistry to access arylazo-1,2,3-triazoles, a previously unexplored class of azoheteroarenes that exhibit high thermal stabilities and near-quantitative bidirectional photoconversion. Controlling the catalyst or 1,3-dipole grants access to both regioisomeric arylazotriazoles and arylazoisoxazoles, highlighting the versatility of our approach.
Copper salt catalyzed addition of arylboronic acids to azodicarboxylates
Uemura, Takeshi,Chatani, Naoto
, p. 8631 - 8634 (2005)
The addition of arylboronic acids 1 to azodicarboxylates 2 in the presence of a catalytic amount of a copper salt under mild reaction conditions gives aryl-substituted hydrazines 3 in high yields. The reaction is tolerant of a wide variety of functional groups.
Synthesis of 1,2-Dihydroquinolines via Hydrazine-Catalyzed Ring-Closing Carbonyl-Olefin Metathesis
Zhang, Yunfei,Sim, Jae Hun,Macmillan, Samantha N.,Lambert, Tristan H.
supporting information, p. 6026 - 6030 (2020/08/05)
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of N-prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the cycloaddition step of the catalytic cycle is shown to be slower, but the cycloreversion is found to be more facile.
Decarboxylative Amination: Diazirines as Single and Double Electrophilic Nitrogen Transfer Reagents
Chandrachud, Preeti P.,Wojtas, Lukasz,Lopchuk, Justin M.
supporting information, p. 21743 - 21750 (2021/01/11)
The ubiquity of nitrogen-containing small molecules in medicine necessitates the continued search for improved methods for C-N bond formation. Electrophilic amination often requires a disparate toolkit of reagents whose selection depends on the specific structure and functionality of the substrate to be aminated. Further, many of these reagents are challenging to handle, engage in undesired side reactions, and function only within a narrow scope. Here we report the use of diazirines as practical reagents for the decarboxylative amination of simple and complex redox-active esters. The diaziridines thus produced are readily diversifiable to amines, hydrazines, and nitrogen-containing heterocycles in one step. The reaction has also been applied in fluorous phase synthesis with a perfluorinated diazirine.
Photocatalytic esterification under Mitsunobu reaction conditions mediated by flavin and visible light
M?rz,Chudoba,Kohout,Cibulka
supporting information, p. 1970 - 1975 (2017/03/11)
The usefulness of flavin-based aerial photooxidation in esterification under Mitsunobu reaction conditions was demonstrated, providing aerial dialkyl azodicarboxylate recycling/generation from the corresponding dialkyl hydrazine dicarboxylate. Simultaneously, activation of triphenylphosphine (Ph3P) by photoinduced electron transfer from flavin allows azo-reagent-free esterification. An optimized system with 3-methylriboflavin tetraacetate (10%), oxygen (terminal oxidant), visible light (450 nm), Ph3P, and dialkyl hydrazine dicarboxylate (10%) has been shown to provide efficient and stereoselective coupling of various alcohols and acids to esters with retention of configuration.
A containing hydrazine nitrogen phosphorus ligand complex and its in ester the application of the catalytic hydrogenation of
-
Paragraph 0088; 0089; 0090, (2017/01/31)
The invention relates to a composition containing hydrazine nitrogen and phosphorus ligands and application of the composition in catalytic hydrogenation with ester. The invention relates to the metal composition which is shown by a general formula MXY (L) and a method for preparing alcohols through hydrogenation reduction of carbonyl compounds such as ketones and estersby using the composition as catalysts. In the MXY (L), the M is metal Fe, Ru, Os, Co, Rh, Ir and other transition group metal, the X and the Y can be the same anion ligand or different anion ligands, and the L is a tetradentate ligand containing -NH-pyridyl and two heteroatoms. The composition disclosed by the invention has the advantages that the catalytic activity is high and the stability is strong.
Visible light-mediated decarboxylative amination of indoline-2-carboxylic acids catalyzed by Rose Bengal
Zhang, Meng-Jie,Schroeder, Griffin M.,He, Yan-Hong,Guan, Zhi
, p. 96693 - 96699 (2016/10/25)
A visible light-induced decarboxylative amination of indoline-2-carboxylic acids and azodicarboxylate esters has been developed, in which the oxidation of α-amino acids provides a versatile CO2-extrusion platform to generate α-aminoalkyl radicals. The corresponding products were obtained with yields of up to 72% catalyzed by a metal-free photocatalyst under mild conditions.
ORGANOCATALYTIC CARBONYL-OLEFIN AND OLEFIN-OLEFIN METATHESIS
-
Paragraph 0160, (2014/02/16)
The present invention provides, inter alia, organocatalytic carbonyl-olefin metathesis process. This process involves contacting a carbonyl-containing moiety with an olefin-containing moiety in the presence of a catalyst and under conditions sufficient to form a metathesis product with the proviso that the process takes place in the absence of photochemical promotion, stoichiometric amounts of transition metals, and Brnsted and Lewis acid catalysts. The present invention also provides an organocatalytic olefin-olefin metathesis process. This process involves contacting a first olefin-containing moiety with a second olefin-containing moiety in the presence of a catalyst and under conditions sufficient to form a metathesis product with the proviso that the process takes place in the absence of stoichiometric amounts of transition metals. Products made by the processes disclosed herein are also provided.
Efficient synthesis of cyclopropylhydrazine salts
Shibue, Taku,Fukuda, Yasumichi
, p. 4102 - 4104 (2014/07/22)
An efficient procedure for the synthesis of cyclopropylhydrazine in the form of its salts is reported. The copper salt-catalyzed addition of cyclopropylboronic acid to the azo group of di-tert-butyl azodicarboxylate and subsequent deprotection gave the cy