Efficient syntheses of 1,2,3,4,4a,5-hexahydro-pyrazino[2,1-c][1,4]benzothiazine-6,6-dioxide
摘要:
Expeditious routes to 1,2,3.4,4a,5-hexahydro-pyrazino[2,1-c][1,4]benzothiazine-6,6-dioxide, a methylenesulfone-constrained arylpiperazine, have been developed. The key step forms the tricyclic system in a cascade of reactions via a 1,4-addition, nitrogen alkylation, and aromatic substitution sequence. (C) 2010 Elsevier Ltd. All rights reserved.
Heterogeneous Photocatalytic Radical Synthesis of Aryl Allyl Sulfones
作者:Liang Wang、Ling-feng Zhang
DOI:10.1055/s-0042-1752344
日期:2022.12
A photocatalytic synthesis of aryl allyl sulfones by a radical cascade reaction from an aryl diazonium salt, DABCO·(SO2)2 and 3-bromoprop-1-ene has been developed. This reaction employed DABCO·(SO2)2 as the SO2 source and a polyaniline–graphitic carbon nitride–titanium dioxide composite as the photocatalyst. A series of substrates were tolerated, providing the corresponding products in good yields
Photoredox-Catalyzed Radical–Radical Cross-Coupling of Sulfonyl Chlorides with Trifluoroborate Salts
作者:Sheng-Ping Liu、Yan-Hong He、Zhi Guan
DOI:10.1021/acs.joc.3c01124
日期:2023.8.4
synthesis of sulfone compounds with diverse structures by visible-light-catalyzed radical–radical cross-coupling of sulfonylchlorides and trifluoroborate salts. Allyl, benzyl, vinyl, and aryl trifluoroborates can be successfully cross-coupled with (hetero)aryl and alkyl sulfonylchlorides, respectively. This strategy features redox neutrality, good substrate generality, simple operation, and benign reaction
Process for the nucleophilic substitution of unactivated aromatic and heteroaromatic substrates
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0094821A1
公开(公告)日:1983-11-23
A process for achieving nucleophilic substitution upon an unactivated monocyclic or polycyclic aromatic or heteroaromatic substrate bearing a suitable leaving group comprising the substitution of said leaving group by an anionic nucleophile is catalyzed with a cyclic or acyclic polydentate chelating ligand, e.g. a crown ether or a cyclic polyether. The process is applicable, inter alia, as the first step in the preparation of ortho-substituted benzenesulfonyl chloride derivatives, or ortho-benzenedithiol, from ortho-dichlorobenzene.