In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called N,N-Dialkyl-N’-Chlorosulfonyl Chloroformamidines in Heterocyclic Synthesis. Part XII.* Synthesis and Reactivity of the Pyrazolo[3,4-e][1,2,4]thiadiazine Ring System, published in 2015, which mentions a compound: 118430-78-7, mainly applied to pyrimidothiadiazine preparation; pyrazolothiadiazine preparation; dialkylchlorosulfonyl chloroformamidine aminopyrazole dinucleophilic substitution methylation alkylation, Computed Properties of C8H9N3S.
N,N-Dialkyl-N’-chlorosulfonyl chloroformamidines 1 reacted regioselectively with 1-substituted 5-aminopyrazoles 2 via a 1,3-CCN dinucleophilic substitution to afford pyrazolo[3,4-e][1,2,4]thiadiazines 3 e. g., I, as the sole isolated products. Compounds 3, representatives of a very rare ring system, were shown to possess three nucleophilic sites at N2, N4, and N6. Methylation occurred at all three sites. Alkylation with benzylic halides occurred preferentially at N2, but some also occurred at N4, and at C7a. Alkylation with Et bromoacetate occurred at both N4 and N6, but the latter derivatives underwent a pyrazole ring expansion to afford pyrimido[4,5-e][1,2,4]thiadiazine derivs, e. g., II. Compounds 3 were unreactive towards various acylating agents.
If you want to learn more about this compound(1-Methyl-3-(thiophen-2-yl)-1H-pyrazol-5-amine)Computed Properties of C8H9N3S, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(118430-78-7).
Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem