G. Labbe et al., A NEW APPROACH TO AZAPENTALENES BY AN ADDITION-REARRANGEMENT SEQUENCE- SYNTHESIS OF FUSED 1,2,4-THIADIAZOLES, Journal of the Chemical Society. Perkin transactions. I, (16), 1993, pp. 1825-1826
Carbamoylimino substituted thiazolo[3,2-b][1,2,4]thiadiazoles 7 and 8,
[1,3,4]thiadiazolo[3,2-b]-[1,2,4]thiadiazole 9, [1,2,4]thiadiazolo[3,
2-b]benzoxazole 10, [1,2,4]thiadiazolo[3,2-b]benzothiazole 11 and [1,2
,4]thiadiazolo[2,3-a]benzimidazole 12 are conveniently prepared from 5
-chloro-1,2,4-thiadiazol-3-(2H)-one 6 and an appropriate 2-aminoazole
by an addition-rearrangement sequence.