SCHEDULED MAINTENANCE
The 3-aryl-2-cyanothioacrylamides 2–4 react well with methyl propiolate and dimethyl acetylenedicarboxylate yielding the thiopyrans 8–13. Reactions with less activated alkynes proceed sluggishly, if at all.
J. Bloxham and C. P. Dell, J. Chem. Soc., Perkin Trans. 1, 1994, 989 DOI: 10.1039/P19940000989
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