Studies toward the total synthesis of 1-oxacephalosporins 1: 3-amino-4-thio-2-azetidinones with protected γ.γ'-dihydroxyalkenoate side chain
作者:Dieter Hoppe、Hans Schmincke、Heinz-Werner Kleemann
DOI:10.1016/0040-4020(89)80098-5
日期:1989.1
trans-benzoylanino-4-methylthio-2-azetidinones 16, bearing an acetonide-protected β,β'-bis(hydroxymethyl)acrylate moiety and being potential candidates for the total synthesis of 1-oxacephems, were obtained from 2,2-dimethyl-1,3-dioxan-5-one (4), alkyi isocyanoacetates 3 and azidoacetyl chloride (5) with 5 steps in overall yields of 13–33%. 2-Formylaminoacrylates 6, 1,3-thiazoline-4-carboxylates 9, produced by di=rect
从2,2-获得外消旋的反式苯甲酰氨基-4-甲硫基-2-氮杂环丁酮16,其具有由丙酮化物保护的β,β′-双(羟甲基)丙烯酸酯部分,并且是潜在合成1-氧杂苯醚的潜在候选物。二甲基-1,3-二恶烷-5-酮(4),异氰基乙酸烷基酯3和叠氮基乙酰氯(5),分5步收率,总收率为13-33%。2- Formylaminoacrylates 6,1,3-噻唑啉-4-羧酸盐9,由二制作=的RECT硫杂化6,和S-甲基thioformimidates 14是中间体。