1,2,4-Dithiazolium salts, condensation with

Condensation of 3,5-diaryl-l,2,4-dithiazolium salts 46 with lithium cyclopentadienides affords tricyclic azadithia heterocycles 73 (Scheme 10) <1994TL3893, 1997LA221>. 

In the condensations of o-aminohenzyl alcohol 376 or anthranilic acid 401 with 4,5-dichloro-l,2,3-dithiazolium chloride (Appel s salt) 402, imino-l,2,3-dithiazoles 403 were formed. Heating of the imino alcohol 403 (X = H2) in THE in the presence of NaH afforded an 11 1 mixture of 3,1-benzoxazine 404 and 3,1-benzothiazine 405 in moderate yield. Thermal cyclization of imino acid 403 (X = 0) resulted nearly quantitatively in formation of 3,1-henzoxazin-4-one 406 (Scheme 76) <1995CC1419, 1995J(P 1)2097, 1997SL704>. 

A range of condensed 1,3,2-dithiazolium mono- and bis-salts 43-45, 70, and 71 are formed in the ring-closure reaction of o-bis(sulfenylchloride)heteroarenes with trimethylsilyl azide (Equation 18) <1997JA2633, 2001JMC1992, 2004JA8256, 1998JA352>. 

Condensation of 4,5-dichloro-l, 2,3-dithiazolium chloride 23 (Appel s salt) with various ort/zo-halogenated anilines and aminopyridines 22 gives the... 

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