Simple and condensed β-lactams. Part 20. Reaction of some 1-(4-methoxyphenyl)azetidin-2-ones with cerium(IV) ammonium nitrate (CAN): Trapping of the quinone imine intermediate with chloride and iodide anions
作者:József Fetter、Le Thanh Giang、Tibor Czuppon、Károly Lempert、Mária Kajtár-Peredy、Gábor Czira
DOI:10.1016/s0040-4020(01)86713-2
日期:1994.4
1-(4-methoxyphenyl)azetidin-2-ones 12 and 13, when treated with cerium(IV) ammonium nitrate (CAN), afford either their N-deprotected derivatives (19, 26) or the chlorinated compounds 22 and 27, respectively, as the main products, depending on whether sodium chloride was present or not. A series of minor products (20, 21, 23–25 and 29, respectively) are formed in addition. 1-(4-Methoxyphenyl)azetidin-2-ones
1-(4-甲氧基苯基)氮杂环丁烷-2-酮12和13,当与铈(IV)铵(CAN)处理,得到任一其Ñ -deprotected衍生物(19,26)或氯化化合物22和27分别,作为主要产品,取决于是否存在氯化钠。一系列的次要产物(20,21,23-25和29被形成在除了分别)。1-(4-甲氧基苯基)氮杂环丁烷-2-酮13和14当依次用CAN和碘化钠处理时,分别以良好的收率得到相应的1-(4-羟基苯基)氮杂环丁烷-2-酮28和30。后面的反应可能为详细阐述N-(2-和4-烷氧基苯基)羧酰胺的脱烷氧基-羟基化的一般方法奠定基础。机制被建议用于化合物的形成19 - 30。