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    • 3. 发明授权
    • Intermediates for 3-aminoazetidin-2-ones
    • 3-氨基氮杂环丁烷-2-酮的中间体
    • US4226767A
    • 1980-10-07
    • US41281
    • 1979-05-21
    • Robin D. G. CooperGary A. KoppelLawrence J. McShane
    • Robin D. G. CooperGary A. KoppelLawrence J. McShane
    • C07D205/085C07D498/04C07D205/08C07D277/06C07D513/04
    • C07D205/085
    • 1-[.alpha.-(Carboxy)-4-hydroxybenzyl]-3.beta.-aminoazetidin-2-one esters are prepared by converting 2-acyl-3,3-dialkyl-7-oxo-.alpha.-[4-(benzyloxy)phenyl]-4-thia-2,6-diazabicyclo[3.2.0]heptane-6-acetic acid esters with mercuric acetate in an aqueous organic solvent mixture, e.g., in aqueous methanol, to 7-oxo-3-phenyl-.alpha.-[4-(benzyloxy)phenyl]-4-oxa-2,6-diazabicyclo[3.2.0]hept-2-ene-1-acetic acid esters and the latter are reacted with PCl.sub.5 and pyridine to provide the monocyclic 1-[.alpha.-(carboxy)-4-benzyloxybenzyl]-3.beta.-(.alpha.-chlorobenzylideneamino)-4-chloroazetidin-2-one esters. Reduction of the dichloro azetidin-2-one with an organo tin hydride and azobisisobutyronitrile affords the deschloro, 1-[.alpha.-(carboxy)-4-benzyloxybenzyl]-3.beta.-benzylideneaminoazetidin-2-one ester. The latter is hydrolyzed and the benzyloxy group is cleaved via catalytic hydrogenolysis to yield an ester of 1-[.alpha.-(carboxy)-4-hydroxybenzyl]-3.beta.-aminoazetidin-2-one. The 3.beta.-amino ester is useful for the preparation of the antibiotic FR 1923 (nocardicin).
    • 通过将2-酰基-3,3-二烷基-7-氧代-α-[4-(苄氧基)苯基 ] -4-硫杂-2,6-二氮杂双环[3.2.0]庚烷-6-乙酸酯与乙酸汞在含水有机溶剂混合物(例如甲醇水溶液)中加入到7-氧代-3-苯基-α- [4-(苄氧基)苯基] -4-氧杂-2,6-二氮杂双环[3.2.0]庚-2-烯-1-乙酸酯,后者与PCl5和吡啶反应,得到单环1- [ α - (羧基)-4-苄氧基苄基]-3β-(α-氯亚苄基氨基)-4-氯氮杂环丁-2-酮酯。 用有机锡氢化物和偶氮二异丁腈还原二氯氮杂环丁烷-2-酮,得到脱氯,1- [α-(羧基)-4-苄氧基苄基]-3β-亚苄基氨基氮杂环丁-2-酮酯。 将后者水解并通过催化氢解裂解苄氧基,得到1- [α-(羧基)-4-羟基苄基]-3β-氨基吖丁啶-2-酮的酯。 3β-氨基酯可用于制备抗生素FR1923(诺卡霉素)。
    • 8. 发明授权
    • 3.beta.-succinimidoazetidinones as chiral intermediates
    • 3β-琥珀酰亚氨基氮杂环丁酮作为手性中间体
    • US4734498A
    • 1988-03-29
    • US884124
    • 1986-07-10
    • Robin D. G. Cooper
    • Robin D. G. Cooper
    • C07D205/08C07D205/085C07D403/04C07D405/06C07D405/14C07D409/14
    • C07D403/04C07D205/08C07D205/085C07D405/06C07D405/14Y02P20/55
    • 3.beta.-Substituted succinimido)azetidinones represented by the formula ##STR1## wherein R and R.sub.1 are e.g. C.sub.1 -C.sub.5 alkanoyloxy, benzoyloxy, substituted benzoyloxy, or benzyloxy, or one of R and R.sub.1 is hydrogen and the other is as defined above; R.sub.2 is C.sub.1 -C.sub.4 alkoxycarbonyl or an arylvinyl group e.g. styrryl or 2-furylvinyl; and R.sub.3 is e.g. protected-carboxymethyl, or an NH protecting group; are provided via stereoselective cycloaddition of imines with chiral auxiliary 3,4-disubstituted succinimidoacetyl chlorides. The chiral auxiliary e.g., 3S,4S-dibenzoyloxy-and 3S,4S-diacetoxysuccinimidoacetyl chloride, is obtained from tartaric acid via anhydride and imide formation with retention of chirality. The chiral azetidinones obtained are useful intermediates to .beta.-lactam antibacterial compounds.
    • 3β-取代的琥珀酰亚胺基)氮杂环丁酮,其中R和R 1是例如。 C1-C5烷酰氧基,苯甲酰氧基,取代的苯甲酰氧基或苄氧基,或R和R1中的一个是氢,另一个如上所定义; R2是C1-C4烷氧基羰基或芳基乙烯基,例如 苯乙烯基或2-呋喃基乙烯基; 和R3是例如。 保护羧甲基或NH保护基; 通过亚胺与手性辅助3,4-二取代的琥珀酰亚胺基乙酰氯的立体选择性环加成来提供。 手性辅助剂例如3S,4S-二苯甲酰氧基和3S,4S-二乙酰氧基琥珀酰亚胺基乙酰氯通过酸酐和酰亚胺形成由酒石酸获得,并保持手性。 获得的手性氮杂环丁酮是β-内酰胺抗菌化合物的有用中间体。