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- W2802913893 abstract "An efficient protocol for the synthesis of 2,5-substituted 4-acyloxazoles and the related 2,4-substituted 5-acyloxazoles with complementary regioselectivity from the corresponding α-oxoketene dithioacetals or β-(het)aryl/(methylthio)enone precursors has been reported. In the first protocol, the α-oxoketene dithioacetals or β-(methylthio)enones were converted to the corresponding α-bromo-β-(methylthio)enones followed by copper catalyzed inter/intramolecular annulation of these intermediates with various primary amides affording 2-(het)aryl/alkyl-4-(het)aroyl-5-(methylthio)/(het)aryloxazoles via concomitant formation of the C4-N and C5-O bond via enamide intermediates. In the second approach, the starting α-oxoketene dithioacetals or β-(methylthio)-β-(het)arylenones were subjected to base induced conjugate addition-elimination with various primary amides to furnish β-aroylenamides, which, on subsequent iodine catalyzed intramolecular oxidative C-H functionalization/C-O bond formation, afforded the corresponding regioisomeric 2-(het)aryl/alkyl-4-(methylthio)/(het)aryl-5-(het)aroyloxazoles in excellent yields. The methodology has also been extended for the synthesis of regioisomeric 4- or 5-aminooxazoles and 4- or 5-( n-butyl)oxazoles from the corresponding 4- or 5-(methylthio)oxazoles." @default.
- W2802913893 created "2018-05-17" @default.
- W2802913893 creator A5034517583 @default.
- W2802913893 creator A5044746087 @default.
- W2802913893 creator A5074403651 @default.
- W2802913893 date "2018-05-10" @default.
- W2802913893 modified "2023-09-25" @default.
- W2802913893 title "Synthesis of 2,4,5-Trisubstituted Oxazoles with Complementary Regioselectivity from α-Oxoketene Dithioacetals and β-(Methylthio)-β-(het)aryl-2-propenones" @default.
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- W2802913893 doi "https://doi.org/10.1021/acs.joc.8b00900" @default.
- W2802913893 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29745235" @default.
- W2802913893 hasPublicationYear "2018" @default.