Synthetic Studies of Carbapenem and Penem Antibiotics. II. Synthesis of 3-Acetyl-2-azetidinones by (2+2) Cycloaddition of Diketene and Schiff Bases.
作者:Akira SASAKI、Koshiro GODA、Masao ENOMOTO、Makoto SUNAGAWA
DOI:10.1248/cpb.40.1094
日期:——
afford 3-acetyl-2-azetidinone derivatives 4. As an application of this new method, a practical asymmetric synthesis of 4 and its conversion into (3S,4S)-4-carboxy-1-(di-p-anisylmethyl)-3-[(R)-1-hydroxyethyl]-2- azetidinone, which is a key intermediate for the synthesis of carbapenem and penem antibiotics, were accomplished.
发现咪唑作为催化剂可有效地促进双烯酮与席夫碱的(2 + 2)环加成反应,得到3-乙酰基-2-氮杂环丁酮衍生物4。作为该新方法的应用,实际合成了4并转化为(3S,4S)-4-羧基-1-(二对-茴香基甲基)-3-[(R)-1-羟乙基] -2-氮杂环丁酮,这是合成碳青霉烯的关键中间体和青霉素抗生素,完成了。