Ethyl Difluoro(trimethylsilyl)acetate and Difluoro(trimethylsilyl)acetamides – Precursors of 3,3-Difluoroazetidinones
作者:Michel Bordeau、Frédéric Frébault、Mallory Gobet、Jean-Paul Picard
DOI:10.1002/ejoc.200600146
日期:2006.9
Difluoro(trimethylsilyl)acetamides 7 have been prepared from chlorodifluoroacetamides 5 by electrochemical silylation. When condensed with carbonyl compounds, they were shown to be precursors of 2,2-difluoro-3-hydroxyacetamides 8. N-(p-Methoxyphenyl)-2,2-difluoro-3-hydroxy-4-methylvaleramide (8a) has been converted into the corresponding 3,3-difluoroazetidinone 9a. This new route to 3,3-difluoroazetidinones
二氟(三甲基甲硅烷基)乙酰胺 7 已从氯二氟乙酰胺 5 通过电化学硅烷化制备。当与羰基化合物缩合时,它们被证明是 2,2-二氟-3-羟基乙酰胺 8 的前体。 N-(对甲氧基苯基)-2,2-二氟-3-羟基-4-甲基戊酰胺 (8a)转化为相应的 3,3-二氟氮杂环丁烷酮 9a。这种制备 3,3-二氟氮杂环丁酮的新途径被证明是利用二氟(三甲基甲硅烷基)乙酸乙酯与亚胺缩合的途径的替代方法。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)