A New General Method for the Preparation of <i>N</i>-Sulfonyloxaziridines
作者:José Luis García Ruano、José Alemán、Cristina Fajardo、Alejandro Parra
DOI:10.1021/ol052250w
日期:2005.11.1
N-alkylsulfonyl- and N-arylsulfonyloxaziridines from the corresponding N-sulfinylimines involving a one-pot, two-step oxidation process with m-CPBA (1 equiv) and m-CPBA/KOH (1.1 equiv) is reported. The method is applicable to N-sulfinylimines derived from aldehydes (aliphatic and aromatic) and ketones (dialkyl and aryl alkyl) and preserves C=C-conjugated double bonds. Almost quantitative yields, very mild
a new desulfurative method for generating primary, secondary, and tertiary alkyl radicals through visible‐light photoredoxcatalysis. A process that involves the generation of N‐centered radicalsfrom sulfinamide intermediates, followed by subsequent fragmentation, is critical to forming the corresponding alkyl radical species. This strategy has been successfully applied to conjugate addition reactions
Intramolecular Homolytic Substitution Enabled by Photoredox Catalysis: Sulfur, Phosphorus, and Silicon Heterocycle Synthesis from Aryl Halides
作者:Alberto F. Garrido-Castro、Noelia Salaverri、M. Carmen Maestro、José Alemán
DOI:10.1021/acs.orglett.9b01911
日期:2019.7.5
homolytic substitution with the practicality of the modern photocatalytic approach. Predicated on an efficient metal-free dehalogenation of aryl halides under mild organo-photoredox conditions, sulfur, phosphorus, and silicon heteroatoms capture the C(sp2)-centered radical in an intramolecular fashion.
Traditional preparation of sulfenamides require the use of low oxidation state of sulfur reagent such as RSCl, (RS)2 or RSH, which are toxic, odorous and difficult to deal with due to the harsh reaction conditions. Here high oxidation state of sulfur reagent—aliphatic sulfinamide, were used for preparation of sulfenamide in one step efficiently. Different aromatic amines with all sorts of functional
Synthesis of 4,7-Difunctionalized Indoles via Imino Exchange and Sulfinyl Migration
作者:Xiaohua Li、Lei Li、Weiyi Wang、Qiuqin He、Renhua Fan
DOI:10.1021/acs.orglett.9b04257
日期:2020.2.7
7-difunctionalized indolesfrom 2-alkynycyclohexadienimines, sulfinamides, and nucleophiles (amines or alcohols) was developed. The process involves imino exchange, cascade cyclization/1,4-nucleophilic addition/aromatization, and 1,3-migration of the sulfinyl group. The 7-sulfinyl group is easy to convert into the sulfonyl or the thioether group through a simple oxidation and reduction reaction.