Synthesis of 2,2,2‐Trifluoroethyl Oxazoles, Oxazolines and Furans via Alkyne Oxytrifluoromethylation
作者:Jia‐Jia Dong、Song‐Lin Zhang
DOI:10.1002/adsc.201901405
日期:2020.2.21
This study reports an oxytrifluoromethylation method for construction of oxazoles and furans motif and the concurrent incorporation of a 2,2,2‐trifluoroethyl group at the aromatic C5‐position. High‐valent copper(III) trifluoromethyl compounds are crucial to this reaction that induces oxy‐trifluoromethylation of alkynes with a pendant amide/enol group functioning as the oxygen‐nucleophile. A wide substrate
The versatile conversion of propargylic amides to the respective 2-substituted 5-methyloxazoles was efficiently catalyzed by Zn(OTf)2 (5 mol%) under microwave irradiation in toluene. The method was applicable to a wide range of aliphatic, aromatic and heteroaromatic propargylic amides and thus represents a useful method which is complementary to the existing metal-catalyzed protocols, considering the
Erratum to “Zn(OTf)2-catalyzed, microwave-promoted synthesis of 2-substituted 5-methyloxazoles from propargylic amides” [Tetrahedron Lett. 60 (2019) 777–779]