Synthesis of fused s-triazoles from 2-methanesulfonyl-5-phenyl-1,3,4-oxadiazole and binucleophilic reagents by means of intramolecular ring transformation.
作者:TADASHI SASAKI、MASATOMI OHNO、EIKOH ITO
DOI:10.1248/cpb.32.5040
日期:——
2-Methanesulfonyl-5-phenyl-1, 3, 4-oxadiazole (4) reacted with 3-aminopropanol and 2-aminoethanethiol in the presence of triethylamine to give displaced and rearranged products 2-(5, 6-dihydro-4H-1, 3-oxazin-2-yl)-(6b) and 2-(2-thiazolin-2-yl) benzhydrazide (9), which were further cyclodehydrated by heating to give the corresponding fused s-triazoles (7) and (10), respectively. In the case of the reaction with a diaminoalkane only the 1 : 2 adduct (8) was obtained.
2-Methanesulfonyl-5-phenyl-1, 3, 4-oxadiazole (4) 与 3-aminopropanol 和 2-aminoethanethiol 在三乙胺存在下反应,得到置换和重排产物 2-(5、6-二氢-4H-1, 3-恶嗪-2-基)-(6b) 和 2-(2-噻唑啉-2-基) 苯肼 (9),加热使其进一步环水化,分别得到相应的融合 s-三唑 (7) 和 (10)。在与二氨基烷反应的情况下,只得到 1 : 2 的加合物 (8)。