作者:G. V. Boyd、P. H. Wright
DOI:10.1039/j39700001485
日期:——
in dichloromethane to give the highly labile anhydro-2-hydroxyoxazolo [3,2-a]pyridinium hydroxide in solution. Stable acyl and azo-derivatives of this mesoionic compound are obtained by electrophilic substitution reactions; amines open the oxazolone ring with the formation of amides of 1,2-dihydro-2-oxopyridineacetic acid. The oxazolopyridinium per chlorate condenses with aromatic aldehydes to give
用乙酸酐和高氯酸处理1,2-二氢-2-氧吡啶并-1-乙酸产生2,3-二氢-2-氧代恶唑并[3,2- a ]吡啶鎓高氯酸盐,在三乙胺中被质子化。二氯甲烷,得到高度不稳定的脱水-2-羟基恶唑啉[3,2- a ]氢氧化吡啶溶液。该中离子化合物的稳定的酰基和偶氮衍生物是通过亲电取代反应获得的;胺打开1,2-二氢-2-氧吡啶吡啶乙酸的酰胺形成恶唑酮环。高氯酸盐中的恶唑吡啶鎓与芳香醛缩合,得到有色的亚芳基衍生物,而水杨基化合物很容易重排成香豆素。香豆素也由与介离子碱的反应而得到的ö-羟基芳烃甲醛。中离子恶唑酮的二聚分解产物显示为其3-[((1,2-二氢-2-氧代-1-吡啶基)乙酰基]衍生物。