A conversion of o-phenylenediamines into benzotriazoles was achieved at room temperature using tert-butyl nitrite. The optimized conditions are also well suited for the transformation of sulfonyl and acyl hydrazines into corresponding azides. This protocol does not require any catalyst or acidic medium. The desired products were obtained in excellent yields in a short span of time.
Direct Synthesis of Benzo[<i>f</i>]indazoles from Sulfonyl Hydrazines and 1,3-Enynes by Copper-Catalyzed Annulation
作者:Biao Yao、Tao Miao、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.8b03564
日期:2019.1.4
A novel and efficient strategy for the directsynthesis of benzo[f]indazoles via copper-catalyzed cascade reaction of sulfonyl hydrazides with 1,3-enynes under mild conditions has been developed. This method achieves the formation of two C–N bonds and one C–C bond in one pot, providing a series of benzo[f]indazoles in moderate to good yields with good functional group tolerance and remarkable regioselectivity
提出了一种在温和条件下通过磺酰肼与1,3-烯炔的铜催化级联反应直接合成苯并[ f ]吲唑的新颖有效策略。此方法可在一锅中形成两个C–N键和一个C–C键,从而以中等至良好的收率提供了一系列苯并[ f ]吲唑,并具有良好的官能团耐受性和显着的区域选择性。
Pd-Catalyzed decarboxylative alkynylation of alkynyl carboxylic acids with arylsulfonyl hydrazides<i>via</i>a desulfinative process
作者:Sheng Chang、Ying Liu、Shu Zhu Yin、Lin Lin Dong、Jian Feng Wang
DOI:10.1039/c8nj02964d
日期:——
In the presence of a Pd(II)/P-ligand catalytic system, decarboxylative alkynylation of alkynyl carboxylicacids and arylsulfonyl hydrazides by desulfinative coupling could provide aryl alkynes in satisfactory yields by either judiciously selecting palladium catalysts or modulating phosphine ligands under mild conditions. The reported coupling reactions are very practical as they do not require the
efficiently prepared by direct C-3 arylation of indolizines using sodium arylsulfinates and arylsulfonylhydrazides. Pd-catalyzed desulfitative C-3 arylation with sodium arylsulfinates was achieved with the assistance of peroxides, and the catalytic efficiency was promoted by N-containing ligands. Arylsulfonylhydrazides were also successfully applied in Pd-catalyzed desulfitative C-3 arylation with indolizines
TBAI-mediated sulfenylation of arenes with arylsulfonyl hydrazides in DPDME
作者:Wei Yueting、Liu Yali、He Jing、Li Xuezhen、Liu Ping、Zhang Jie
DOI:10.1016/j.tet.2020.131646
日期:2020.11
An efficient TBAI (tetrabutylammonium iodide)-mediated C-H sulfenylation of arenes with arylsulfonyl hydrazides in dipropylene glycol dimethyl ether (DPDME) was described. Various electron-rich arenes were applicable in the reaction, such as naphthylamine, naphthol, aniline, indole, pyrrole, and imidaz o [1,2, 2(a)] pyridine. A wide range of the aryl sulfides were obtained with good functional group