The Dimroth Rearrangement in the Synthesis of Condensed Pyrimidines – Structural
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Abstract Cyanothioacetamide reacts with pyrazole-3 (5)-diazonium chlorides to afford
pyrazolo [5, 1-c][1, 2, 4] triazine-3-carbothioamides 5. The latter can be oxidized with H 2 O 2 …

Diazotization of 3‐methyl‐4‐phenyl‐1H‐pyrazol‐5‐amine 1 in hydrochloric acid has been
reported to afford the corresponding diazonium salt 2. The latter underwent azocoupling with …

Reaction of fused 3-(2-bromoethyl) pyrimidin-4 (3H)-ones with primary alkylamines gave
abnormal fused 3-alkyl-4-alkyliminopyrimidines via a new rearrangement, as well as normal …

Azo coupling of 1, 3‐dicarbonyl compounds with tetrazolyl‐5‐diazonium chloride is used to
develop a convenient one‐step procedure for the synthesis of 4, 7‐dihydrotetrazolo [5, 1 …

Polynitrogen heterocycles are often subject to Dimroth rearrangement which consists of ring
opening, bond rotation, and ring closure. In this note, we report a synthesis of two new …

Starting with bis ([1, 3, 4] thiadiazolo)[1, 3, 5] triazinium halides, a novel class of heterocyclic
compounds, the [1, 3, 4] thiadiazolo [2, 3-d][1, 2, 4] triazolo [1, 5-a][1, 3, 5] triazinium halides …

The one-pot synthesis of dibenzo [b, d] azepin-7-one (3) was selectively achieved from 1-
phenacyl-1, 2, 3-benzotriazole (1) using the catalytic flash vacuum pyrolysis (cfvp) …

Unexpected ANRORC rearrangement in pyran ring | Chemistry of Heterocyclic Compounds
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A series of substituted diheteroaryl sulfides was synthesized by the reaction of 4, 6-
diaminopyrimidine-2 (1 H)-thione with fluoro-and chloroheteroaromatic compounds in the …