中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 5-chloro-2-benzyl-1,3,4-oxadiazole | 130781-66-7 | C9H7ClN2O | 194.62 |
—— | N-(5-benzyl-1,3,4-oxadiazol-2-yl) benzamidine | 132380-91-7 | C16H14N4O | 278.313 |
—— | N-<5-Benzyl-1,3,4-oxdiazolyl-(2)>-N'-phenylharnstoff | 6756-31-6 | C16H14N4O2 | 294.313 |
—— | N-(5-benzyl-1,3,4-oxadiazol-2-yl) 4-chlorobenzamidine | 132380-92-8 | C16H13ClN4O | 312.758 |
N,N-dialkyl-N′-chlorosulfonylchloroformamidines 1 were treated with 2-aminothiazoline, 2-aminothiazoles, 2-aminobenzothiazoles, 2-amino-1,3,4-thiadiazoles, and 2-amino-1,3,4-oxadiazoles to give a 6,7-dihydrothiazolo[3,2-b][1,2,4,6]thiatriazine dioxide 3, a 6,7-dihydrothiazolo[2,3-c][1,2,4,6]thiatriazine dioxide 4, thiazolo[3,2-b][1,2,4,6]thiatriazine dioxides 5, [1,2,4,6]thiatriazino[3,2-b]benzothiazole dioxides 7, a [1,2,4,6]thiatriazino[3,4-b]benzothiazole dioxide 8, [1,3,4]thiadiazolo[2,3-c][1,2,4,6]thiatriazine dioxides 10, [1,3,4]thiadiazolo[3,2-b][1,2,4,6]thiatriazine dioxides 11, [1,3,4]oxadiazolo[2,3-c][1,2,4,6]thiatriazine dioxides 13, and [1,3,4]thiadiazolo[3,2-b][1,2,4,6]thiatriazine dioxides 14. Compounds 3, 4, 5, 7, 8, 10, 11, 13, and 14 are derivatives of new ring systems.
A convenient methodology has been developed for the synthesis of substituted 2-amino-1,3,4-oxadiazoles from corresponding acylthiosemicarbazides using catalytic amount of iodine/KI in the presence of Oxone® as a bulk oxidant. This offers the advantage of short reaction times and substrate variability which is suitable for the rapid production of analogues required for lead optimisation programmes. The method could also be useful for large-scale synthesis because of the mild reaction conditions and the use commercially inexpensive and safe reagents.