Under thermal conditions, 1,4,2-dioxazol-5-ones are known to undergo decarboxylation followed by Lossen’s rearrangement to yield isocyanates. Described herein is the in situ trapping of the resulting isocyanates with carbon nucleophiles to synthesize β-keto amides. Furthermore, a general and mild method for the conversion of the resulting β-keto amides into quinolin-2-ones is reported.
在热条件下,已知 1,4,2-dioxazol-5-ones 会先脱羧,然后发生 Lossen 重排,生成
异氰酸酯。本文描述的是用碳亲核试剂原位捕获所得
异氰酸酯以合成β-酮酰胺。此外,还报道了一种将所得 β-酮酰胺转化为
喹啉-2-酮的通用且温和的方法。