The reaction of S4N4 with cyano- and trifluoromethyl-substituted alkynes gives trithiadiazepines (1b-d) in good yield; with less reactive alkynes the yields of trithiadiazepines (1) are greatly improved by titanium(IV) chloride catalysis, making a range of functional derivatives of this ring system readily available.
P. J. Dunn and C. W. Rees, J. Chem. Soc., Chem. Commun., 1987, 59 DOI: 10.1039/C39870000059
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