1,2-Difunctionalization of Aryl Triflates: A Direct and Modular Access to Diversely Functionalized Anilines
作者:Seoyoung Cho、Qiu Wang
DOI:10.1021/acs.orglett.0c00320
日期:2020.2.21
ortho-Amino difunctionalization of aryl triflates has been achieved via a three-component reaction. The cascade reaction proceeds through a zincate base-mediated deprotonative formation of a reactive aryne intermediate, in situ nucleophilic addition, and coupling with electrophilic partners. This strategy leverages the advantageous reactivity of organozincate intermediates, enabling the installation
An electrostatically directed meta borylation of sterically biased and unbiased substrates is described. The borylation follows an electrostatic interaction between the partially positive and negative charges between the ligand and substrate. With this strategy, it has been demonstrated that a wide number of challenging substrates, especially 4-substituted substrates, can selectively be borylated at
Synthesis of Thiocarbamoyl Fluorides and Isothiocyanates Using Amines with CF<sub>3</sub>SO<sub>2</sub>Cl
作者:Jingjing Wei、Shuaishuai Liang、Lvqi Jiang、Wenbin Yi
DOI:10.1021/acs.joc.0c01634
日期:2020.10.2
A practical and efficientmethod to synthesize thiocarbamyl fluorides and isothiocyanates from amines with trifluoromethanesulfonyl chloride was developed. In the presence of the reducing agent triphenylphosphine and sodium iodide, thiocarbamyl fluorides and isothiocyanates were synthesizedfrom secondary/primary amine in moderate to excellent yields, respectively. A broad scope of substrates and good
Divergent Strain‐Release Amino‐Functionalization of [1.1.1]Propellane with Electrophilic Nitrogen‐Radicals
作者:Ji Hye Kim、Alessandro Ruffoni、Yasair S. S. Al‐Faiyz、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1002/anie.202000140
日期:2020.5.18
facilitated by the electrophilic nature of these open-shell intermediates and the presence of strong polareffects in the transition-state for C-N bond formation/ring-opening. With the aid of a simple reductive quenching photoredox cycle, we have successfully harnessed this novel radical strain-release amination as part of a multicomponent cascade compatible with several external trapping agents. Overall, this
The Gabriel synthesis is generalized as monoalkylation of an ammonia or primary amine derivative with subsequent removal of the derivatizing group(s) from nitrogen. Two new derivatives for this purpose are introduced: phenacylsulfonamides and triflamides, with discussion of their generality and effectiveness.