A novel method for metal‐free oxothiolation of ynamides to construct oxazolidine‐2,4‐diones bearing sulfur‐substituted quaternary carbonatoms has been developed. It represents a rare C−O bond cleavage of ynamides, as well as a facile and tandem approach for the formation of C−O, C−S, and C−Cl bonds. This redox‐neutral protocol can be applied to the synthesis of multisubstituted oxazolidine‐2,4‐diones
PhI(OAc)<sub>2</sub>-mediated trifluoromethylthiolation/oxidative cyclization of ynamides
作者:Shixuan Su、Zhipeng Yan、Xingyuan Ye、Jingyang Wang、Yuan Li、Guangke He
DOI:10.1039/d1ob01642c
日期:——
A PhI(OAc)2-mediated trifluoromethylthiolation/oxidative cyclization of ynamides with the Shen reagent has been established herein, providing a facileaccess to CF3S-substituted oxazolidine-2,4-diones bearing a quaternary carbon center in 38–85% yields with chemoselectivities of up to 99/1.
Cu(I)‐Catalyzed Oxytrifluoromethylation of
<i>N</i>
‐Boc‐Ynamides for the Construction of Trifluoromethylated Oxazolones
作者:Yue Zuo、Xingyuan Ye、Dongjie Jiang、Shuai Zhou、Mengyuan Yu、Guangke He
DOI:10.1002/adsc.202200971
日期:2022.12.8
A chemo-selective copper(I)-catalyzed oxytrifluoromethylation of N-Boc-ynamides with TMSCF3 has been achieved, affording the trifluoromethylatedoxazolones in 51–99% yields. The reaction proceeds at room temperature and tolerates a variety of functional groups such as −X, −OMe, alkenyl, and other substituents. The resulting oxazolones provide access to α-CF3-substituted amines through decarboxylative
Synthesis of Functionalized Oxazolones by a Sequence of Cu(II)- and Au(I)-Catalyzed Transformations
作者:Florin M. Istrate、Andrea K. Buzas、Igor Dias Jurberg、Yann Odabachian、Fabien Gagosz
DOI:10.1021/ol703077g
日期:2008.3.1
A study concerning a two-step sequence leading to the formation of diversely 1,5-disubstituted oxazolones is described. The mild conditions employed allow the efficient and rapid synthesis of a variety of such compounds via an initial Cu(II)-catalyzed coupling of a bromoalkyne with a secondary tert-butyloxycarbamate followed by a Au(I)-catalyzed cycloisomerization of the N-alkynyl tert-butyloxycarbamates thus obtained.