Oxokohlenstoffe und verwandte Verbindungen; 12. Mitteilung. Eine einfache Synthese von 3-Hydroxy-3-cyclobuten-1,2-dion ("Semiquadratsäure"; "Moniliformin") und dessen Umsetzung mit Aminen
作者:Arthur H. Schmidt、Harry Maibaum
DOI:10.1055/s-1987-27861
日期:——
Oxocarbons and Related Compounds; Part 12. A Simple and Efficient Synthesis of 3-Hydroxy-3-cyclobutene-1,2-dione ("Semisquaric Acid"; "Moniliformin") and its Reaction with Amines Starting with squaric acid (1), semisquaric acid (4) has been synthesized in a 54% overall yield. In contrast to a literature report semisquarie acid (4) reacts with ammonia (5a) and aniline (5b) in the cold to give the ammonium-semisquarates 6a and 6b, respectively, and not the corresponding semisquaric amides. Accordingly, several primary, secondary, and tertiary amines react with 4 to afford the semisquarates 6c-k. Semisquaric amide (8) has been obtained unambiguously by the catalytic hydrogenation of 3-amino-4-chloro-3-cyclobutene-1,2-dione (7).
氧碳化合物及相关化合物;第12部分。一种简单有效的合成3-羟基-3-环丁烯-1,2-二酮(“半四酸”;“念珠菌素”)及其与胺的反应 以四酸(1)为起始物,半四酸(4)已以54%的总产率合成。与文献报道相反,半四酸(4)在低温下与氨(5a)和苯胺(5b)反应,分别生成半四酸盐6a和6b,而非相应的半四酸酰胺。因此,多种一级、二级和三级胺与4反应生成半四酸盐6c-k。通过催化氢化3-氨基-4-氯-3-环丁烯-1,2-二酮(7),明确地得到了半四酸酰胺(8)。