Abstract
A new route to esters of ( E)-2-(styrylsulfonyl)aceticacid has been developed. Treatment of the methyl ester with hydrazine hydrategave the six-membered 4-amino-5-phenylthiomorpholine-3-one 1,1-dioxide( 1), and not the seven-membered 6-phenyl-1,4,5-thiadiazepane-3-one1,1-dioxide ( 2) as previously describedby others. In contrast, treatment of the ethyl ester with the samereagent provided a separable 1:1.2 mixture of 1 and 2. The NMR spectra of both 1 and 2 differed substantially from that describedfor 2 in the previous report.
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