Synthetic Studies of Carbapenem and Penem Antibiotics. I. Facile Synthesis of a Key Intermediate:4-Acetoxy-3-(1-hydroxyethyl)-2-azetidinone.
作者:Makoto SUNAGAWA、Haruki MATSUMURA、Masao ENOMOTO、Takaaki INOUE、AKira SASAKI
DOI:10.1248/cpb.39.1931
日期:——
A highly efficient synthesis of(3R, 4R)-4-acetoxy-3-[(R)-1-hydroxyethyl]-2-azetidinone, which is a key intermediate for the synthesis of carbapenem and penem antibiotics, was accomplished. It was found that oxymercuration-reduction of easily obtainable 4-alkyloxycarbonyl-1-(di-p-anisylmetyl)-3-ethenyl-2-azetidinone could be employed as a key stereoselective reaction. The chiral starting material was obtained by optical resolution or asymmetric (2+2) cycloaddition. The desired product was afforded in four steps, that is, oxymercuration-reduction, oxidative decarboxylation, protection of the hydroxy group and removal of the N-protecting group.
高效合成了(3R,4R)-4-乙酰氧基-3-[(R)-1-羟乙基]-2-氮杂环丁酮,这是合成碳青霉烯类和青霉烯类抗生素的关键中间体。研究发现,容易获得的4-烷氧基羰基-1-(二-对茴香基甲基)-3-乙烯基-2-氮杂环丁酮的氧汞化还原可以作为关键的立体选择性反应。通过光学拆分或不对称(2+2)环加成获得手性原料。经过氧汞化还原、氧化脱羧、羟基保护和N-保护基脱除四步得到所需产物。