申请人:Pfizer Inc.
公开号:US04419284A1
公开(公告)日:1983-12-06
Process for preparation of halomethyl esters (and related esters) of penicillanic acid 1,1-dioxide of the formula ##STR1## where X is Cl, Br, I, certain alkylsulfonyloxy or arylsulfonyloxy groups, useful as intermediates in production of antibiotics having beta-lactamase activity, which comprises hydrogenolysis of an ester of the formula ##STR2## where n is zero, 1 or 2; Y and Z are each Cl, Br or I, or Y is H and Z is Cl, Br, I, C.tbd.N-- or SCN--, or Y is arylselenyl and Z is Cl or Br; and when n is zero or 1, oxidation of the hydrogenolysis product; a process for preparing compounds of formula (VI, n=2) by oxidation of the corresponding compound (VI) wherein n is zero or 1, and certain novel intermediates useful in the above processes.
制备青霉素酸1,1-二氧化物的卤甲酯(和相关酯)的过程的公式为##STR1##其中X为Cl、Br、I、某些烷基磺酰氧或芳基磺酰氧基团,用作生产具有β-内酰胺酶活性的抗生素的中间体,包括以下步骤:对公式为##STR2##的酯进行氢解反应,其中n为零、1或2;Y和Z分别为Cl、Br或I,或者Y为H且Z为Cl、Br、I、C.tbd.N--或SCN--,或者Y为芳基硒基且Z为Cl或Br;当n为零或1时,对氢解产物进行氧化反应;通过氧化对应化合物(VI)制备公式为(VI,n=2)的化合物的过程,其中n为零或1,并且在上述过程中使用的某些新型中间体。