Synthesis of trisubstituted 1,3-oxazin-6-ones via base-catalyzed ring-opening annulation of cyclopropenones with N-(pivaloyloxy)amides
作者:Takanori Matsuda、Kentaro Yamanaka、Yuki Tabata、Takahiro Shiomi
DOI:10.1016/j.tetlet.2018.02.084
日期:2018.4
azalactone structure. In the presence of catalytic K2CO3 at 60 °C in THF, the disubstituted cyclopropenone couples with benzamides, acrylamides, and a phenylacetamide to produce 2,4,5-trisubstituted 1,3-oxazin-6-ones in 23–99% yield.
报道了环丙烯酮和N-(新戊酰氧基)酰胺之间的碱催化的[3 + 3]型环。将1,3-N,O-偶极形式正式插入环丙烯酮C C键会产生六元氮杂内酯结构。在60°C的THF中存在催化性K 2 CO 3的情况下,双取代的环丙烯酮与苯甲酰胺,丙烯酰胺和苯乙酰胺偶合,可在23–99中产生2,4,5-三取代的1,3-恶嗪-6-酮。 % 屈服。