1,4,2-Dioxazol-5-ones as Isocyanate Equivalents: An Efficient Synthesis of 2-Quinolinones via β-Keto Amides
作者:Ramakrishna Guduru、Anand Vala、Nirali Parmar、Jigar Y Soni、Sharadsrikar Kotturi
DOI:10.1055/s-0040-1720889
日期:2021.12
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。