Derkach, G. I. published the artcileDerivatives of phosphorylated amidines, Quality Control of 7668-28-2, the publication is Zhurnal Obshchei Khimii (1962), 1878-82, database is CAplus.
cf. CA 56, 3405d. Refluxing 3-amino-1,2-benzisosulfonazole (Ia) with 1.25 moles PCl5 in C6H6 until HCl evolution had stopped, followed by evaporating in vacuo, gave I (R = N:PCl3), m. 165-9°, which refluxed 1 hr. with H2O gave Ia. The trichloride and glacial AcOH in C6H6 gave after brief refluxing and 12 hrs. at room temperature I (R = NHPOCl2), m. 213-14°. Similarly the trichloride and 6 moles PhNH2 in C6H6 gave I [(R = N:P(NHPh)3], m. 214-15°; with EtNH2, I [R = N:P(NHEt)3], m. 171-2° with 4 moles PhNH2 in C6H6, I [R = NHPO(NHPh)2], m. 260-1°. Refluxing I [R = N:P(NHPh)3] 15 min. in 96% EtOH gave I [R = NHPO(NHPh)2]. I (R = NHPOCl2) with EtNH2 in C6H6 gave after brief refluxing I [R = NHPO(NHEt)2], m. 219-20°; similarly was prepared I [R = NHPO(NHC6H4Cl-p)2], m. 249-53°. Also reported was I [R = NHPO(OPh)2], m. 257-9°. p-O2NC6H4C(:NSO2Ph)NH2 and PCl5 similarly gave p-O2NC6H4C(:NSO2Ph)N: PCl3 (II), an oil, which with AcOH in C6H6 2 hrs. at 40° gave p-O2NC6H4C(:NSO2Ph)NHPOCl2, m. 161-3°, which with PhNH2 gave p-O2NC6H4C(:NSO2Ph)NHPO(NHPh)2, m. 221-2°. Reaction of II with PhONa in dioxane gave p-O2NC6H4C(:NSO2Ph)NHPO(OPh)2, m. 154-6°.
Zhurnal Obshchei Khimii published new progress about 7668-28-2. 7668-28-2 belongs to isothiazole, auxiliary class Sulfamide,Amine,Benzothiazole, name is 3-Aminobenzo[d]isothiazole 1,1-dioxide, and the molecular formula is C7H6N2O2S, Quality Control of 7668-28-2.
Referemce:
https://en.wikipedia.org/wiki/Isothiazole,
Isothiazole – ScienceDirect.com