Efficient methods for the synthesis of fluoroalkylated alkenylboronates are very limited, despite their importance in modern organicsynthesis. Herein, we report a palladium-catalyzed trans-fluoroalkylation–borylation of alkynes with fluoroalkyl iodides and B2pin2. The reaction tolerates a series of difluoroalkyl iodides and perfluoroalkyl iodides and can enable coupling with a variety of alkynes,
base/B2pin2-mediated iodofluoroalkylation of alkynes and a part of alkenes, using ethyl difluoroiodoacetate (ICF2CO2Et) or ICnF2n+1 (n = 3, 4, 6) as difluoroacetylating or perfluoroalkylating reagent, is disclosed. The reaction proceeds under mild conditions, and iododifluoroalkylation, hydrodifluoroalkylation and several perfluoroalkylation products were generated from alkynes or alkenes. Notably, this methodology
使用二氟碘乙酸乙酯 (ICF 2 CO 2 Et) 或 IC n F 2n+1 (n = 3, 4, 6) 作为二氟乙酰化或全氟烷基化试剂的碱基/B 2 pin 2介导的炔烃和部分烯烃的碘氟烷基化,被披露。该反应在温和条件下进行,由炔烃或烯烃生成碘二氟烷基化、氢二氟烷基化和几种全氟烷基化产物。值得注意的是,该方法提供了一种从简单的炔烃或烯烃开始获得二氟烷基化和全氟烷基化有机化合物的简单途径。
Enantioselective Nickel‐Catalyzed Denitrogenative Transannulation En Route to N‐N Atropisomers
作者:Fang-Bei Ge、Chuan-Jun Lu、Xiao Chen、Wang Yao、Mei An、Yu-Kun Jiang、Li-Ping Xu、Ren-Rong Liu
DOI:10.1002/anie.202400441
日期:——
Ni-catalyzed asymmetric synthesis of N−Natropisomers by denitrogenative annulation of 1,2,3-benzotriazones with internal alkynes is presented. A wide variety of N−Natropisomers were synthesized with excellent regio- and enantioselectivity under mild reaction conditions.
提出了通过 1,2,3-苯并三腙与内部炔烃的脱氮环化,Ni 催化不对称合成 N−N 阻转异构体。在温和的反应条件下合成了多种 NN 阻转异构体,具有优异的区域选择性和对映选择性。
Controlled Single and Double Iodofluorination of Alkynes with DIH- and HF-Based Reagents
作者:Lukas Pfeifer、Véronique Gouverneur
DOI:10.1021/acs.orglett.8b00321
日期:2018.3.16
terminal alkynes using 1,3-diiodo-5,5,-dimethylhydantoin and HF-based reagents is disclosed. This approach is used to prepare a fluorinated tamoxifen derivative in two steps from commercially available starting materials. A facile method enabling controlled regioselective double iodofluorination of terminal alkynes is also presented.
Alkyne metathesis with simple catalyst systems: High yield dimerization of propynylated aromatics; scope and limitations
作者:Neil Gregory Pschirer、Uwe H.F. Bunz
DOI:10.1016/s0040-4039(99)00282-8
日期:1999.3
yield dimerization of propynylated benzenes and propynylnaphthalene by a mixture of Mo(CO)6 and 4-chlorophenol at 140 °C in 1,2-dichlorobenzene is reported to give the corresponding disubstituted alkynes. The scope and limitation of the reaction and the influence of substitution pattern and substitution type are discussed. Oxygen or nitrogen carrying substrates metathesize in moderate to good yields