Intramolecular Carbocupration of N-Aryl-ynamides: A Modular Indole Synthesis
摘要:
A modular indole synthesis based on an intramolecular 5-endo-dig carbocupration starting from readily available N-aryl-ynamides Is reported. A variety of ynamides are converted to indoles in moderate to good yields and with varying substitution pattern on the indole ring. This further extends the synthetic utility of ynamides in organic synthesis and provides additional insights on the use of intramolecular carbometalation reactions.
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
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