In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Oxazole Synthesis by Sequential Asmic-Ester Condensations and Sulfanyl-Lithium Exchange-Trapping, published in 2021-02-19, which mentions a compound: 740806-67-1, mainly applied to anisylsulfanylacetonitrile alkyl carboxylate tandem deprotonation asmic ester condensation alkylation; anisylsulfanyl oxazole halide tandem deprotonation asmic ester condensation alkylation; oxazole preparation, Application of 740806-67-1.
Oxazoles were rapidly assembled through a sequential deprotonation-condensation of Asmic, anisylsulfanylmethyl isocyanide, with esters followed by sulfanyl-lithium exchange-trapping. Deprotonattion of Asmic afforded a metalated isocyanide that efficiently trapped esters to afford oxazoles bearing a versatile C-4 anisylsulfanyl substituent. Interchange of the anisylsulfanyl substituent was readily achieved through a first-in-class sulfur-lithium exchange-electrophilic trapping sequence whose versatility was illustrated in the three-step synthesis of the bioactive natural product streptochlorin.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider