作者:Neil D Pearson、Terence C Smale、Robert Southgate
DOI:10.1016/0040-4039(95)00767-7
日期:1995.6
Condensation of phenyl glyoxal with azetidin-2-ones (1a-c) gave the hemi-aminals (2a-c). Subsequent conversions produced the 4-(formylthio)phosphoranes (4a-c) which gave on heating the 3-benzoylpenems (5a-c), formed by intramolecular Wittig cyclisation. Thermal isomerisation of trans-6-substituted-3-benzoylpenems allowed the preparation of the cis-6-substituted-3-benzoylpenems (7a-c). Using similar
苯乙二醛与氮杂环丁烷-2-酮(1a-c)的缩合得到半缩醛(2a-c)。随后的转化产生了4-(甲硫基)膦酸酯(4a-c),其通过加热通过分子内维蒂希环化形成了3-苯甲酰基penems(5a-c)。反式-6取代的-3-苯甲酰基青霉烯的热异构化允许制备顺式-6取代的-3-苯甲酰基青霉烯(7a-c)。使用相似的方法,合成了戊烯酰胺(7d-e)。