A stereoselectivesynthesis of chiralthienamycinintermediate (10) involving a diastereoselective Michael addition and a silicon-induced Pummerer-type reaction is described.
A new process for preparing optically active 3-substituted azetidinones
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP0421283A2
公开(公告)日:1991-04-10
A process for preparing optically active 3-substituted azetidinones of the formula
in which R¹ is hydroxy-protective group by a multi-step process. The invention also comprises a process for preparing optically active compound of the formula
in which R² is protected carboxy,
by enzymatic hydrolysis, preferably using esterase, preferably derived from microorganism belonging to genus Pimelobacter or Bacillus like FERM BP-3086 and FERM BP-3087. The invention also comprises biologically pure cultures of such microorganism and compounds of the formula
and process for their preparation.
一种制备光学活性 3-取代的式氮杂环丁酮的工艺
其中 R¹ 为羟基保护基的多步制备工艺。本发明还包括一种制备光学活性式化合物的工艺
其中 R² 是受保护的羧基、
通过酶水解,最好使用酯酶,酯酶最好来自属于皮膜杆菌属或芽孢杆菌属的微生物,如 FERM BP-3086 和 FERM BP-3087。本发明还包括此类微生物的生物纯培养物和式如下的化合物
及其制备工艺。
KITA, YASUYUKI;SHIBATA, NORIO;MIKI, TAKASHI;TAKEMURA, YUMIKO;TAMURA, OSAM+, J. CHEM. SOC. CHEM. COMMUN.,(1990) N0, C. 727-729
Enzymatic process for preparing optically active 3-substituted
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US05241064A1
公开(公告)日:1993-08-31
Preparation of optically active 3-substituted azetidinones of the formula (I) ##STR1## in which R.sup.1 is a hydroxy-protective group wherein an allylic alcohol of the formula (II) ##STR2## is acylated, then subjected to asymmetric enzymatic hydrolysis yielding the R-allylic alcohol. The hydroxyl group is protected and then stereoselectively reacted with an amine which is subsequently cyclized to yield the desired 3-substituted azetidinone. Two new species of microorganisms have been isolated, Pimelobacter sp. No. 1254 and Bacillus megaterium No. 1253 which exhibit stereoselective esterase activity.