作者:Rita Annunziata、Maurizio Benaglia、Mauro Cinquini、Franco Cozzi
DOI:10.1016/s0957-4166(99)00566-2
日期:1999.12
The synthesis of two 2-azetidinones possessing powerful cholesterol-absorption inhibition properties has been accomplished by a short and highly stereoselective reaction sequence. The key step is the condensation of the titanium enolate of the easily prepared 2-pyridylthioester (R)-11 with imine 6 which affords the desired β-lactam intermediate in the correct relative and absolute configuration. Conversion
通过短而高度立体选择性的反应序列已经完成了具有强大的胆固醇吸收抑制特性的两种2-氮杂环丁酮的合成。关键步骤是使易于制备的2-吡啶基硫酯(R)-11的烯醇钛与亚胺6缩合,从而以正确的相对和绝对构型提供所需的β-内酰胺中间体。通过简单的官能团操作可以容易地完成向药理活性化合物的转化。