Novel process for the preparation of azetidin-2-ones of the formula ##STR1## wherein R.sup.1 and R.sup.2 independently from each other are hydrogen, or an organic group linked to the ring carbon via a carbon atom, a nitrogen atom or an oxygen atom, characterized in that a corresponding 4-acyloxyazetidin-2-one, which is substituted by a group --O--CO--R.sup.3 at the 4-position, wherein R.sup.3 is hydrogen or an organic radical stable at the reaction conditions, is reacted with a complex metal hydride comprising reactive hydride ions, such as, lithium borohydride, sodium borohydride, potassium borohydride, zinc borohydride or tetraorganoammonium borohydride.
一种制备式为##STR1##的氮杂
环戊酮的新工艺,其中R.sup.1和R.sup.2独立地是氢或有机基团,通过碳原子、氮原子或氧原子连接到环碳上,其特征在于将对应的4-酰氧基氮杂
环戊酮与一个包含反应性
氢化物离子的复合
金属
氢化物反应,例如
锂硼氢化物、
钠硼氢化物、
钾硼氢化物、
锌硼氢化物或四有机
铵硼氢化物,在4位处被一个-O-CO-R.sup.3基团取代,其中R.sup.3是在反应条件下稳定的氢或有机基团。