Azetidine carboxylic acid esters are converted into enol silyl ethers which, as enamino ketene acetals, undergo ready oxidative cleavage of the ethylenically unsaturated double bond, e.g. by dye-sensitized photo-oxygenation, to form beta-lactams. The beta-lactams and substitution products thereof are useful intermediates in the synthesis of biologically active lactams.
氮杂四元
环羧酸酯可以转化为烯醇
硅基醚,作为烯胺酮基酮醇缩合物,经过
染料敏化的光氧化反应,可以轻易地断裂不饱和双键,形成β-内酰胺。β-内酰胺及其取代产物是合成
生物活性内酰胺的有用中间体。