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 Synthesis of quinolines from the Baylis-Hillman acetates via the oxidative cyclization of sulfonamidyl radical as the key step, published in 2002-08-26, which mentions a compound: 481054-89-1, mainly applied to quinolinecarboxylate preparation oxidative cyclization, Recommanded Product: 481054-89-1.
Et 3-quinolinecarboxylates I were synthesized in good to moderate yields from the Baylis-Hillman acetates II via the oxidative cyclization reaction of the N-tosylamidyl radical, which was generated from the rearranged tosylamide derivatives III by iodobenzene diacetate and iodine.
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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem