<i>N</i>-Halogen Compounds of Cyanamide Derivatives. VII. The Preparation and Amidination of 5-Ethoxy-<i>Δ</i><sup>4</sup>-1,2,4-thiadiazolines
作者:Toshio Fuchigami、Tsutomu Nonaka、Keijiro Odo
DOI:10.1246/bcsj.49.3170
日期:1976.11
2-Methoxycarbonimidoyl and 2-amidino-3-imino-5-ethoxy-Δ4-1,2,4-thiadiazolines (I and II) were prepared by the reaction of potassium ethoxythiocarbonylcyanamide (III) with N-chloro compounds of O-methylisourea and guanidine. Δ4-1,2,4-Thiadiazoline, I reacted with aliphatic amine to give 2-amidino-Δ4,2,4-thiadiazolines and 1,3,5-triazines in the presence of both the free amines and amine hydrochlorides. The ring opening of Δ4-1,2,4-thiadiazoline, which finally results in the formation of 1,3,5-triazine, was found to be catalyzed mainly by a base and also by an acid.
乙氧基硫代甲酰氰胺钾(III)与 O-甲基异脲和胍的 N-氯化合物反应,制备出 2-甲氧基碳酰亚胺基和 2-氨基-3-亚氨基-5-乙氧基-Δ4-1,2,4-噻二唑啉(I 和 II)。Δ4-1,2,4-噻二唑啉 I 与脂肪族胺反应,在游离胺和胺盐酸盐存在下生成 2-氨基-Δ4,2,4-噻二唑啉和 1,3,5-三嗪。研究发现,Δ4-1,2,4-噻二唑啉的开环过程主要由碱和酸催化,最终形成 1,3,5-三嗪。