Synthesis of Novel 2-Substituted-1,3,4-thiadiazoles.
作者:Yoshio MATSUBARA、Kazutada KITANO、Takayuki YAMAMOTO、Toshihisa MAESHIMA
DOI:10.1248/cpb.46.329
日期:——
New 2-monosubstituted and 2, 2-disubstituted 2, 3-dihydro-3, 5-diphenyl-1, 3, 4-thiadiazoles (2) were synthesized by the reaction of N'-phenylthiobenzoylhydrazide with aliphatic, aromatic and heterocyclic aldehydes and ketones in the presence of trimethylsilyl chloride in benzene. The reaction proceeded smoothly to afford the corresponding 1, 3, 4-thiadiazoles (2a-2j) in excellent yields (84-96%) except for a few cases, such as the 5-methyl-2-furfural and 2-acetylthiophene systems. 2, 3-Dihydro-2, 2-dimethyl-3, 5-diphenyl-1, 3, 4-thiazole (2f) showed curative activity against powdery mildew of wheat.
新合成了2-单取代和2, 2-双取代的2, 3-二氢-3, 5-二苯基-1, 3, 4-硫噁唑(2),通过在苯中使用三甲基氯硅烷与芳香、脂肪和杂环醛和酮反应,反应是平稳进行的,除了几个例外情况(如5-甲基-2-呋喃醛和2-乙酰硫烯体系),获得了相应的1, 3, 4-硫噁唑(2a-2j),产率优异(84-96%)。2, 3-二氢-2, 2-二甲基-3, 5-二苯基-1, 3, 4-噻唑(2f)对小麦白粉病表现出了治愈活性。