Catalyst-free sulfonylation of activated alkenes for highly efficient synthesis of mono-substituted ethyl sulfones in water
作者:Yu Yang、Lin Tang、Sheng Zhang、Xuefeng Guo、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c4gc00932k
日期:——
A catalyst-free sulfonylation reaction of activated alkenes with sulfonyl hydrazides was efficiently developed under mild and environmentally benign conditions, in water without any ligand or additive. The reaction gave a range of structurally diverse mono-substituted ethyl sulfones with excellent yields, in which the by-product was nitrogen.
for the synthesis of β-sulfonyl esters from sulfonyl hydrazides and acrylicesters promoted by DABCO (1,4-diazabicyclo[2.2.2]octane) is described. The reaction is conducted through sulfa-Michael additionreaction in the absence of solvent at 75°C within 2–3 h. The effects of different bases, molar ratio of DABCO, temperature and time parameters on yield of reaction were investigated.
Development of a Synthetic Method for Multifunctionalized Pyrroles Using Isocyanide Dichloride as a Key Intermediate
作者:Takahiro Soeta、Akihiro Matsumoto、Yutaka Ukaji
DOI:10.1021/acs.joc.8b00185
日期:2018.4.20
Multifunctionalized pyrrole derivatives were synthesized using a highly efficient method based on the Michael addition of carbanions generated in situ from isocyanide dichloride to α,β-unsaturated carbonyl compounds. The reactions proceeded smoothly to afford the pyrrole derivatives in good to high yields. A wide range of Michael acceptors, such as α,β-unsaturated carbonyl compounds and nitroolefin
Promoting Catalytic <i>C</i>-Selective Sulfonylation of Cyclopropanols against Conventional <i>O</i>-Sulfonylation Using Readily Available Sulfonyl Chlorides
作者:Thangeswaran Ramar、Andivelu Ilangovan、Murugaiah A. M. Subbaiah
DOI:10.1021/acs.joc.3c01230
日期:2023.10.6
β-sulfonylation of cyclopropanols by a mechanism that potentially involves an oxidative addition of a sulfonyl radical to a metal homoenolate. Unlike reported methods, this protocol allows a practical synthetic route to γ-keto sulfone building blocks from cyclopropanols by leveraging commercially available aryl- and alkyl-sulfonyl chlorides, common reagents in organic chemistry laboratories. Using