This work reports a green method for the synthesis of aryl selenocyanates via a three‐component reaction of arylboronicacids, Se powder, and trimethylsilyl cyanide (TMSCN) undermetal‐free and additive‐freeconditions. Remarkably, TMSCN acts as not only the substrate, but also the catalyst. Various selenaheterocycles can be also accessed with a catalytic amount of TMSCN.
Synthesis of Monofluoromethyl Selenoethers of Aryl and Alkyl from Organoselenocyanate via One‐Pot Reaction
作者:Yuan Cao、Lvqi Jiang、Wenbin Yi
DOI:10.1002/adsc.201900480
日期:2019.9.17
approach for the monofluoromethylselenolation of aryl and alkyl halides via one‐pot multistep synthesis using KSeCN and ICFH2 is described. Good yields and broad functional group compatibility were obtained. The successful preparation of monofluoromethylselenolated drug‐like compounds good practicability of this method. This protocol offered a number of new monofluoromethyl selenoethers, which would accelerate
Using fluoroform for constructing aromatic and heterocyclic trifluoromethylselenyl compounds
作者:Cheryl Aharon、Shlomo Rozen
DOI:10.1016/j.jfluchem.2021.109866
日期:2021.10
trifluoromethyl moiety was reacted with aromatic and heterocyclic selenium cyanide derivatives to form the corresponding trifluoromethylselenium compounds. Selenium cyanides were made with 1,3-dicyanotriselenide prepared in situ from malononitrile and selenium dioxide. The electrophilicity of the reagent (δ+SeCN) was enough to attack aniline derivatives at the para position, but with other aromatics it
intermediates. The first ipso-selenocyanation of arylboronicacids is achieved using selenium dioxide and malononitrile under mild conditions. The reaction is successful even without metal or base in DMSO. The major advantages of this new method are an easy set-up, excellent yields, and the use of odorless and inexpensive selenium reagents. Basic conditions subsequently afford new access to diaryldiselenides
Metal-Free Synthesis of Unsymmetrical Organoselenides and Selenoglycosides
作者:Yong Guan、Steven D. Townsend
DOI:10.1021/acs.orglett.7b02526
日期:2017.10.6
A one-pot, metal-free procedure has been developed to synthesize unsymmetrical organoselenides. In the first step of the reaction, arylation of potassium selenocyanate (KSeCN) with an iodonium reagent proceeds in the absence of a metal catalyst to produce an arylselenocyanate. In the second step, treatment with sodium borohydride unmasks a second selenium nucleophile that engages an aliphatic electrophile