Ring Transformations of Semicyclic 1,3-Dicarbonyl Heteroanalogs; I. Synthesis of Semicyclic<i>N</i>-Acyl- and<i>N</i>-(Aminocarbonyl)amidine Derivatives and Their Ring Transformation to 5-(ω-Aminoalkyl)-1,2,4-triazoles
作者:Jürgen Liebscher、Michael Pätzel、Yohanes Ferrero Kelboro
DOI:10.1055/s-1989-27353
日期:——
The semicyclic N-(thioacyl)- or N-(aminothiocarbonyl)amidines 11 are readily available through reaction of O-methyllactims 9 or in situ generated lactam acetales 10 with aminothiocarbonyl compounds 7 or with carboxamides or ureas 8 and sulfurization of the resultant semicyclic N-acyl- or N-(aminocarbonyl)amidines 12 with P4S10. The semicyclic N-(thioacyl)- or N-(aminothiocarbonyl)amidines 11 are converted into the S-alkylation products 13. Reaction of 13 with hydrazines gives rise to ring transformation resulting in 5-(Ï-aminoalkyl)-1,2,4-triazoles 17. The same products 17 can be obtained by treating semicyclic N-acyl-or N-(aminocarbonyl)amidines 12 first with POCl3 and then with hydrazines. Similarly, reaction of the N-phenyl-N′-(thiazolidin-2-yliden) thiourea (20) with methyl iodide and hydrazine yields 3-(2-mercaptoethylamino) -5-(phenylamino)-1,2,4-triazole (22).
半环状N-(硫酰基)或N-(氨基硫羰基)酰胺11可以通过O-甲基乳酸亚胺9或原位生成的内酯醇酮10与氨基硫羰基化合物7或与羧酰胺或尿素8反应,随后使用P4S10对生成的半环状N-酰基或N-(氨基羰基)酰胺12进行硫化而得到。半环状N-(硫酰基)或N-(氨基硫羰基)酰胺11被转化为S-烷基化产物13。产物13与肼反应会引起环的转化,生成5-(ω-氨基烷基)-1,2,4-三唑17。同样,首先用POCl3处理半环状N-酰基或N-(氨基羰基)酰胺12,然后再与肼反应,也能得到相同的产物17。类似地,N-苯基-N'-(噻唑烯-2-基)硫脲(20)与碘化甲基和肼的反应生成3-(2-巯基乙基氨基)-5-(苯氨基)-1,2,4-三唑(22)。