Results 51 to 60 of about 92,195 (127)
Synthesis of 2H-Indazoles by the [3 + 2] Dipolar Cycloaddition of Sydnones with Arynes
, 2016 A rapid and efficient synthesis of 2H-indazoles has been developed using a [3 + 2] dipolar cycloaddition of sydnones and arynes. A series of 2H-indazoles have been prepared in good to excellent yields using this protocol, and subsequent Pd-catalyzed ...
Feng Shi (305643) +3 more
core +1 more source
Tetrahydroxydiboron-mediated metal-free synthesis of 2H-indazoles via reductive heterocyclization
A concise, efficient, green, and metal-free reductive heterocyclization reaction has been established for the construction of 2H-indazoles. With low-toxic, eco-friendly tetrahydroxydiboron serving as the reducing agent, this protocol exhibits a...
Wu-Bin Zhi +7 more
core +1 more source
Visible-Light-Promoted Direct C3-H Cyanomethylation of 2H-Indazoles. [PDF]
ACS Omega, 2023 Mi X, Cui B, Song J, Zhang J.
europepmc +1 more source
, 2023 An iminoiodane-enabled oxidative ring-opening of 2H-indazoles via C–N bond cleavage has been developed under metal-free reaction conditions. This methodology afforded a new array of unsymmetrical ortho-N-acylsulfonamidated azobenzenes with a wide ...
Alakananda Hajra (1600114) +1 more
core +1 more source
, 1995 The synthesis of novel 2-aryl-3-phenylamino-4,5-dihydro-2H-benz[g]indazoles 4a-f, starting from N-phenyl-3,4-dihydro-1(2H)-oxonaphthalene-2-carbothioamide and the proper arylhydrazines, is described.
Filippelli W +7 more
core +1 more source
, 2016 An operationally simple and efficient one-pot synthesis of 2H-indazoles from commercially available reagents is reported. Ortho-imino-nitrobenzene substrates, generated via condensation, undergo reductive cyclization promoted by tri-n-butylphosophine to ...
Liuqing Wei (839643) +2 more
core +1 more source
, 2016 Base-catalyzed tandem carbon−carbon followed by nitrogen−nitrogen bond formations quantitatively converted N-alkyl-2-nitro-N-(2-oxo-2-aryl-ethyl)-benzenesulfonamides to 2H-indazoles 1-oxides under mild conditions.
Jaroslav Zajíček (1676527) +3 more
core +1 more source
Synthesis of 2H-Indazoles by the [3 + 2] Cycloaddition of Arynes and Sydnones
, 2016 A rapid and efficient synthesis of 2H-indazoles has been developed, which involves the [3 + 2] dipolar cycloaddition of arynes and sydnones.
Feng Shi (305643) +3 more
core +1 more source
Access to 2-substituted-2H-indazolesviaa copper-catalyzed regioselective cross-coupling reaction
, 2018 A copper-catalyzed C–N cross-coupling reaction using commercially available 1H-indazoles with hypervalent iodine reagents to afford biologically active 2-substituted-2H-indazole is described.
Xianhua Pan +5 more
core +1 more source
, 2018 A metal-free visible-light-induced phosphonylation of 2H-indazoles with diphenylphosphine oxide has been developed using rose bengal as an organophotoredox catalyst under ambient air at room temperature.
Rajib Sarkar (5006831) +3 more
core +1 more source