Synthesis of an optically pure 3-unsubstituted β-lactam using an asymmetric Reformatsky reaction and its conversion to cholesterol absorption inhibitors
作者:B.B. Shankar、M.P. Kirkup、S.W. McCombie、J.W. Clader、A.K. Ganguly
DOI:10.1016/0040-4039(96)00764-2
日期:1996.6
Asymmetric induction by several chiral alcohols in the reaction of their bromoaceates with imines in the presence of activated Zn (Reformatsky reaction) was studied. -2-phenylcyclohexanol and phenyl menthol gave β-lactam 9, obtained by cyclizing the diastereoisomeric β-aminoesters 8, in > 99%ee. The resulting chiral 3-unsubstituted azetidin-2-one 9 was converted to 3-substituted products 11, 12, and
研究了几种手性醇在溴代乙酸与亚胺在活化锌存在下的反应(Reformatsky反应)中的不对称诱导作用。-2-苯基环己醇和苯基薄荷醇产生β-内酰胺9,该β-内酰胺9是通过将非对映异构体β-氨基酯8环化而得到的,含量> 99%ee。将得到的手性3-未取代的氮杂环丁烷-2-酮9转化为具有胆固醇吸收抑制活性的3-取代的产物11、12和13。