It is a common heterocyclic compound, the benzoxazole compound, 5-Bromobenzo[d]oxazole, cas is 132244-31-6 its synthesis route is as follows.
General procedure: A 10 mL pressure tube was charged with a mixture of oxazoles or thiazoles 1a-f (1.0 mmol),boronic acids 2a-o (1.0 mmol), FeCl3 (0.05 mmol), 1,10-Phenanthroline (0.1 mmol), DCIB(1.3 mmol), Cs2CO3 (1.5 mmol) and DMF (2 mL). The pressure tube was then sealed andheated at 100 C for 16 h. After completion of the reaction (progress was monitored by TLC;SiO2, Hexane/EtOAc = 9:1), the mixture was diluted with hot ethyl acetate (20 mL) andwater (40 mL) and extracted with ethyl acetate (3 ¡Á 10 mL). The combined organic layer waswashed with brine (2 ¡Á 10 mL) and dried over anhydrous Na2SO4. Solvent was removedunder reduced pressure and the remaining residue was purified by column chromatography over silica gel using hexane / ethyl acetate = 9:1 as an eluent to obtain the desired products3a-v in high yields.
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Reference£º
Article; Vodnala, Nagaraju; Gujjarappa, Raghuram; Kabi, Arup K.; Kumar, Mohan; Beifuss, Uwe; Malakar, Chandi C.; Synlett; vol. 29; 11; (2018); p. 1469 – 1478;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem