Interaction of α,α-difluoroazides with trivalent phosphorus compounds and triphenylantimony
摘要:
alpha,alpha-Difluoroazides react with triphenylantimony and various compounds of trivalent phosphorus according to the oxidative fluorination scheme. In the case of trivalent phosphorus compound the primary products are phosphazenes, phosphazides or difluorophosphoranes that may undergo further transformations to the corresponding fluorine derivatives of pentavalent phosphorus.
Sustainable Cascades to Difluoroalkylated Polycyclic Imidazoles
作者:Sheng‐Nan Lin、Yu Chen、Xiao‐Dong Luo、Yi Li
DOI:10.1002/ejoc.202100868
日期:2021.8.20
synthesis of imidazoles from alkenes is described here. Series of highly functionalized polycyclic imidazoles were prepared efficiently with 0.01 equiv. of fac-Ir(ppy)3 as photocatalyst under the irradiation of 3 W blue LEDs. This method is characterized by a wide substrate scope with up to 95 % isolated yield under mild conditions. Mechanistic studies indicated a photocatalyzed direct radical difluoroalkylated
作者:Shengnan Han、Shaodong Liu、Lei Liu、Lutz Ackermann、Jie Li
DOI:10.1021/acs.orglett.9b01400
日期:2019.7.19
alkyne-tethered cyclohexadienones and halogenated fluorinating reagents was accomplished under remarkable mild reaction conditions, thus providing an expedient route to valuable fluorinated chromens. The utility of this transformation was demonstrated by high site selectivity as well as chemo- and diastereoselectivity, broad substrate scope, excellent functional group tolerance, and facile late-stage modification
method for constructing a series of fluorine-containing γ-keto acid derivatives through combining visible-light photoredox catalysis and chiral Lewis acid catalysis. With this dual catalytic strategy, a variety of chiral γ-keto amides containing a gem-difluoroalkyl group and a series of fluorine-containing α,β-unsaturated-γ-keto esters were successfully constructed with high stereoselectivities, respectively
The atomtransferradicaladdition (ATRA) of bromodifluoroacetamides to arylalkynes and terminal alkenes was conducted using von Wangelin's Co catalyst system (CoBr2/1,2-bis(diphenylphosphino)benzene/Zn) in acetone/H2O at 30 °C to afford the corresponding functionalized difluoroacetamides in 33–89% yields. Moreover, the Co catalyst was successfully applied to the tandem addition/cyclization of 1,6-diene
溴二氟乙酰胺与芳基炔烃和末端烯烃的原子转移自由基加成 (ATRA) 使用 von Wangelin 的 Co 催化剂体系 (CoBr 2 /1,2-双(二苯基膦基)苯/Zn) 在丙酮/H 2 O 中在 30 °C 下进行以 33-89% 的收率提供相应的官能化二氟乙酰胺。此外,Co催化剂成功应用于1,6-二烯和-烯炔底物的串联加成/环化反应以及N-烯丙基和N-炔丙基溴二氟乙酰胺的分子内ATRA,显着扩大了自由基二氟烷基化的范围。
Visible-Light-Induced Copper-Catalyzed Intermolecular Three-Component Difluoroalkyl Thiocyanidation of Alkenes
In this report, we develop a new strategy for visible-light-induced, copper-catalyzed three-component difluoroalkyl thiocyanidation of alkenes to construct a series of important difluorothiocyanate compounds. The new approach can also be applied to perfluorothiocyanate compounds, even target molecules containing drug/natural product skeletons. Mechanistic studies provide that the copper complex plays