Beilstein J. Org. Chem.2017,13, 1478–1485, doi:10.3762/bjoc.13.146
2,4,5-trisubstituted oxazoles in good yields.
Keywords: one-pot oxazole synthesis; Suzuki–Miyaura coupling; triazine; 5-(triazinyloxy)oxazole; trisubstituted oxazole; Introduction
Oxazoles are found in numerous natural products and are used as a broad range of artificial compounds [1][2]. In
synthesis of oxazolone from carboxylic acids and amino acids using a dehydrative condensing reagent, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM [19][20][21][22])[23]. Formation of 5-(triazinyloxy)oxazole is also reported to occur when an excess of DMT-MM was used. Recently
trisubstituted oxazoles. Herein, we described an efficient method for the synthesis of trisubstituted oxazoles through a one-pot oxazole synthesis and subsequent Suzuki–Miyaura coupling.
Results and Discussion
The study was initiated with the preparation of the key intermediate, 5-(triazinyloxy)oxazole 3, from
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Graphical Abstract
Scheme 1:
Our strategy for the concise synthesis of 2,4,5-trisubstituted oxazoles.