A practical preparation of the key intermediate for penems and carbapenems synthesis
作者:Barbara Grzeszczyk、Sebastian Stecko、Łukasz Mucha、Olga Staszewska-Krajewska、Marek Chmielewski、Bartłomiej Furman
DOI:10.1038/ja.2013.8
日期:2013.3
A novel, practical and stereoselective synthesis of (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone, a key intermediate in the preparation of β-lactam antibiotics is reported. The crucial step of the synthesis is based on the Cu(I)-mediated Kinugasa cycloaddition/rearrangement cascade between silyl protected (R)-3-butyn-2-ol and the nitrone derived from benzyl hydroxylamine
一种新颖,实用,立体选择性的合成(3R,4R)-4-乙酰氧基-3-[(R)-1-(叔丁基二甲基甲硅烷氧基)乙基] -2-氮杂环丁酮的关键中间体,它是制备β-内酰胺类抗生素的关键中间体被报道。合成的关键步骤基于在甲硅烷基保护的(R)-3-butyn-2-ol与衍生自苄基羟胺和乙醛酸苄酯的腈之间的Cu(I)介导的Kinugasa环加成/重排级联反应。将获得的加合物用钠或锂在液氨中进行脱苄基反应,然后用四乙酸铅氧化,得到最终产物。