A Facile Synthesis of (4S)-4-[(1R)-1-Carboxyethyl]-1-(tert-butyldimenthylsilyl)azetidin-2-one: A Key Intermediate of 1-β-Methylcarbapenems
作者:Masahiko Seki、Tsutomu Miyake、Tatsuya Izukawa、Hiroshi Ohmizu
DOI:10.1055/s-1997-1502
日期:1997.1
Titanium enolate-mediated aldol-type reaction of the chiral N-propionyl-1,3-benzoxyzinone 4 with 4-acetoxyazetidin-2-one (5) gave the 2-(2-oxoazetidin-4-yl)propionic acid derivative 6 in high yield with high selectivity, which was transformed into (4S)-4-[(1R)-1-carboxyethyl]-1-(tert-butyldimethylsilyl)azetidin-2-one (3), a key intermediate of 1-β-methylcarbapenems 1.
烯酸钛介导的手性 N-丙酰基-1,3-苯并氧嗪酮 4 与 4-乙酰氧基氮杂环丁-2-酮 (5) 的醛醇型反应,以高产率和高选择性得到 2-(2-氧代氮杂环丁-4-基)丙酸衍生物 6、6 转化为 (4S)-4-[(1R)-1-羧乙基]-1-(叔丁基二甲基硅烷基)氮杂环丁烷-2-酮 (3),这是 1-δ-² 甲基碳青霉烯类 1 的关键中间体。