H4SiW12O40-catalyzed cyclization of epoxides/aldehydes and sulfonyl hydrazides: An efficient synthesis of 3,4-disubstituted 1H-pyrazoles
Sign Up to like & getrecommendations! Published in 2021 at "Chinese Chemical Letters"
DOI: 10.1016/j.cclet.2021.08.037
Abstract: Abstract A simple and efficient method for the synthesis of pyrazoles through a silicotungstic acid (H4SiW12O40)-catalyzed cyclization of epoxides/aldehydes and sulfonyl hydrazides has been developed. Various epoxides/aldehydes were smoothly reacted with sulfonyl hydrazides to furnish… read more here.
Keywords: catalyzed cyclization; disubstituted pyrazoles; cyclization epoxides; sulfonyl hydrazides ... See more keywords
FeBr3-catalyzed regioselective hydroxysulfenylation of N-allylsulfonamides with sulfonyl hydrazides
Sign Up to like & getrecommendations! Published in 2019 at "Tetrahedron"
DOI: 10.1016/j.tet.2018.12.044
Abstract: Abstract Regioselective hydroxysulfenylation of unactivated C C double bonds was reported. Using FeBr3-bpy as the catalyst, Na2S2O8 as the oxidant, and sulfonyl hydrazides as the sulfenyl sources, hydroxysulfenylation of unfunctionalized olefins proceeded readily, giving a… read more here.
Keywords: hydroxysulfenylation; regioselective hydroxysulfenylation; catalyzed regioselective; febr3 catalyzed ... See more keywords
A general and practical sulfonylation of benzylic ammonium salts with sulfonyl hydrazides for the synthesis of sulfones
Sign Up to like & getrecommendations! Published in 2020 at "Tetrahedron Letters"
DOI: 10.1016/j.tetlet.2020.151975
Abstract: Abstract A practical and efficient approach adopting transition-metal-free cross-coupling of sulfonyl hydrazides with benzyl ammonium salts has been developed to synthesize benzyl sulfones using Cs2CO3 as base under mild conditions. The protocol employs stable and… read more here.
Keywords: ammonium salts; sulfonylation benzylic; sulfonyl hydrazides; general practical ... See more keywords
A Bi(OTf)3-Promoted Hydrosulfonylation of Alkenes with Sulfonyl Hydrazides: An Approach to Branched Sulfones.
Sign Up to like & getrecommendations! Published in 2022 at "Organic letters"
DOI: 10.1021/acs.orglett.2c01657
Abstract: The Bi(OTf)3-promoted hydrosulfonylation of alkenes with sulfonyl hydrazides to produce branched sulfones is reported, in which various branched sulfones (>40 examples) have been prepared in moderate to good yields. The gram-scale reaction and synthesis of… read more here.
Keywords: hydrosulfonylation alkenes; promoted hydrosulfonylation; branched sulfones; sulfonyl hydrazides ... See more keywords
Selective Electrochemical Synthesis of 9-Aryl-10-sulfonyl Substituted Phenanthrene from Alkynes and Sulfonyl Hydrazides.
Sign Up to like & getrecommendations! Published in 2022 at "Organic letters"
DOI: 10.1021/acs.orglett.2c03948
Abstract: An efficient electrochemical synthesis of sulfonated phenanthrenes via the reaction of internal alkynes with sulfonyl hydrazides has been established. The protocol does not require a metal catalyst or external oxidants, providing a green and mild… read more here.
Keywords: electrochemical synthesis; alkynes sulfonyl; selective electrochemical; sulfonyl hydrazides ... See more keywords
Iodine-Promoted Deoxygenative Iodization/Olefination/Sulfenylation of Ketones with Sulfonyl Hydrazides: Access to β-Iodoalkenyl Sulfides.
Sign Up to like & getrecommendations! Published in 2018 at "Organic letters"
DOI: 10.1021/acs.orglett.8b00511
Abstract: A highly regio- and stereoselective synthesis of β-haloalkenyl sulfides using commercially available ketones and sulfonyl hydrazides as starting materials has been developed. This protocol obviates the need for alkynes and traditional sulfenylating agents and therefore… read more here.
Keywords: iodine promoted; ketones sulfonyl; sulfonyl hydrazides; promoted deoxygenative ... See more keywords
The Application of Sulfonyl Hydrazides in Electrosynthesis: A Review of Recent Studies
Sign Up to like & getrecommendations! Published in 2022 at "ACS Omega"
DOI: 10.1021/acsomega.2c04205
Abstract: Sulfonyl hydrazides are viewed as alternatives to sulfinic acids and their salts or sulfonyl halides, which are broadly used in organic synthesis or work as active pharmaceutical substances. Generally, sulfonyl hydrazides are considered good building… read more here.
Keywords: application sulfonyl; sulfonyl hydrazides; radical precursors; hydrazides electrosynthesis ... See more keywords
Dual roles of sulfonyl hydrazides in the catalyst-free sulfonylation of unsaturated benzylic alcohols in water
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DOI: 10.1039/c7gc01847a
Abstract: An atom-economical sulfonylation of unsaturated benzylic alcohols in water is described. In this transformation, dual roles of sulfonyl hydrazides serving as both a sulfonyl source and a reductant have been demonstrated, which enabled a facile… read more here.
Keywords: alcohols water; dual roles; benzylic alcohols; sulfonyl hydrazides ... See more keywords
Electrochemical sulfonylation of thiols with sulfonyl hydrazides: a metal- and oxidant-free protocol for the synthesis of thiosulfonates
Sign Up to like & getrecommendations! Published in 2018 at "Green Chemistry"
DOI: 10.1039/c8gc02143k
Abstract: An efficient electrochemical transformation of structurally diverse sulfonyl hydrazides and thiols into thiosulfonates in the presence of ammonium iodide as redox catalyst and electrolyte in acetonitrile at ambient temperature is reported. Transition metal- and oxidant-free… read more here.
Keywords: electrochemical sulfonylation; sulfonylation thiols; metal oxidant; sulfonyl hydrazides ... See more keywords
Iodine promoted iodosulfonylation of alkynes with sulfonyl hydrazides in an aqueous medium: highly stereoselective synthesis of (E)-β-iodo vinylsulfones
Sign Up to like & getrecommendations! Published in 2018 at "New Journal of Chemistry"
DOI: 10.1039/c8nj01145a
Abstract: A catalyst-free and metal-free sulfonylation reaction for the preparation of (E)-β-iodo vinylsulfones from alkynes with sulfonyl hydrazides and molecular iodine was efficiently developed under mild and environmentally benign conditions, in water without any ligand or… read more here.
Keywords: promoted iodosulfonylation; iodine promoted; iodo vinylsulfones; sulfonyl hydrazides ... See more keywords
Iodine-mediated sulfenylation of 4-hydroxycoumarins with sulfonyl hydrazides under aqueous conditions
Sign Up to like & getrecommendations! Published in 2018 at "New Journal of Chemistry"
DOI: 10.1039/c8nj03461c
Abstract: An efficient, metal-free approach to the synthesis of sulfenylated coumarins based on the iodine catalyzed regioselective sulfenylation of 4-hydroxycoumarins with arylsulfonyl hydrazides was developed under mild conditions in water. Various sulfenylated coumarin derivatives were obtained… read more here.
Keywords: hydroxycoumarins sulfonyl; mediated sulfenylation; iodine mediated; sulfonyl hydrazides ... See more keywords