Copper-Catalyzed Direct Trifluoromethylthiolation of Benzylic C–H Bonds via Nondirected Oxidative C(sp3)–H Activation
摘要:
A copper-catalyzed trifluoromethylthiolation of benzylic sp(3) C-H bonds was developed via nondirected oxidative C-H activation using readily prepared and stable AgSCF3. This reaction provides a novel and straightforward method for the preparation of various benzyl trifluoromethyl sulfides.
Base promoted <i>gem</i>-difluoroolefination of alkyl triflones
作者:Ren-Yin Yang、Hui Wang、Bo Xu
DOI:10.1039/d1cc01132d
日期:——
A new synthesis of gem-difluoroalkenes from readily available alkyl triflones and difluorocarbene precursors such as TMSCF2Br has been reported. The reaction, regardless of electronic effect, gives gem-difluoroalkenes in good to excellent yields. The mechanism may involve deprotonation of triflones, nucleophilic addition, and the elimination of SO2CF3.
Synthesis of Cyclopropenes and Fluorinated Cyclopropanes via Michael Initiated Ring Closure of Alkyl Triflones
作者:Hui Wang、Ren‐Yin Yang、Bo Xu
DOI:10.1002/chem.202104364
日期:2022.4.22
Various cyclopropenes and fluorinated cyclopropanes were prepared from readily available alkyl triflones and electron-deficient alkenes via a Michael addition initiated ringclosure (MIRC) process. This protocol not only has a broad substrates scope but also achieves good chemical yields and moderate diastereoselectivity. The mechanism may involve tandem Michael addition of triflones/intramolecular
Described here is the R3P/ICH2CH2I-promoted dehydroxylativesulfonylation of alcohols with a variety of sulfinates. In contrast to previous dehydroxylativesulfonylation methods, which are usually limited to active alcohols, such as benzyl, allyl, and propargyl alcohols, our protocol can be extended to both active and inactive alcohols (alkyl alcohols). Various sulfonyl groups can be incorporated,
此处描述的是 R 3 P/ICH 2 CH 2 I 促进的醇与各种亚磺酸盐的脱羟基磺酰化反应。与以前的脱羟基磺酰化方法通常仅限于活性醇(如苯甲基醇、烯丙基醇和炔丙醇)相比,我们的方案可以扩展到活性醇和非活性醇(烷基醇)。可以并入各种磺酰基,例如CF 3 SO 2和HCF 2 SO 2,它们是药物化学中感兴趣的氟化基团,其安装受到越来越多的关注。值得注意的是,所有试剂都很便宜且广泛可用,并且在 15 分钟的反应时间内获得了中等到高产率。