Silver-Catalyzed Trifluoromethylalkynylation of Unactivated Alkenes with Hypervalent Iodine Reagents
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b03230
日期:2019.11.1
unactivated alkenes is presented. The reaction is catalyzed by silver(I) trifluoroacetate for the simultaneous construction of two C-C bonds (alkyl-alkyne and alkyl-CF3). By employing versatile hypervalentiodinereagents, ethynylbenziodoxolones, useful trifluoromethylalkynylated compounds can be prepared from simple alkenes displaying excellent functional group tolerability. A radical mechanism is proposed
Radical Pentafluoroethylation of Unactivated Alkenes Using CuCF<sub>2</sub>CF<sub>3</sub>
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.0c01646
日期:2020.6.5
source for the CF2CF3 radical under aerobic conditions at room temperature. Using this system, readily available unactivatedalkenes can be pentafluoroethylated to provide novel allylic CF2CF3 compounds with excellent E-selectivity and functional group tolerability. Mechanistic studies including TEMPO–CF2CF3 trapping and radical clock experiments provided strong evidence for radical pathways, offering
Trifluoromethylation of Unactivated Alkenes with Me<sub>3</sub>SiCF<sub>3</sub> and <i>N</i>-Iodosuccinimide
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b00332
日期:2019.3.1
A novel approach to the trifluoromethylation of unactivated alkenes is presented. This reaction is promoted by N-iodosuccinimide (NIS) undervisiblelight irradiation without the need for photocatalysts. The mild conditions allow the direct synthesis of useful trifluoromethylated (E)-alkenes from readily available alkene feedstocks with excellent functional group tolerability. In addition, using easy-to-handle
catalytic allylic C-H fluorination reaction using a nucleophilic fluoride source is reported. Under the influence of a Pd/Cr cocatalyst system, simple olefin substrates undergo fluorination with Et3N·3HF in good yields with high branched:linear regioselectivity. The mild conditions and broad scope make this reaction a powerful alternative to established methods for the preparation of allylic fluorides
Phosphonated N,N-disubstituted fatty morpholines as bacterial and
申请人:The United States of America as represented by the Secretary of
公开号:US03996353A1
公开(公告)日:1976-12-07
Phosphonated N,N-disubstituted fatty acid morpholine derivatives were prepared by the free radical addition of dialkyl phosphites to terminal and nonterminal double bonds of N,N-disubstituted fatty acid morpholine derivatives. The free radical additions of the dialkyl phosphites to the unsaturated fatty acid morpholine derivatives were initiated by irradiation with gamma radiation from cobalt-60. These new compounds exhibit antimicrobial activity.