Qi, Gang published the artcileSynthesis of coumarin-propanedioic acid dimethyl esters, Synthetic Route of 10543-42-7, the publication is Hecheng Huaxue (2007), 15(4), 466-467, 470, database is CAplus.
Three new coumarin-propanedioic acid di-Me esters were designed and synthesized by matching principle from coumarin and propanedioic acid di-Me ester. The structures were identified by 1H NMR, IR and MS.
Hecheng Huaxue published new progress about 10543-42-7. 10543-42-7 belongs to chlorides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Chloride,Sulfonyl chlorides,Ester, name is Coumarin-6-sulfonyl chloride, and the molecular formula is C9H5ClO4S, Synthetic Route of 10543-42-7.
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https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics