申请人:Eli Lilly and Company
公开号:US04885362A1
公开(公告)日:1989-12-05
Azetidinone-2 intermediates represented by the formula ##STR1## wherein R is phenyl, phenoxy or thienyl, R.sub.1 is --CH.dbd.CH--COOR.sub.1 ' wherein R.sub.1 ' is an ester, e.g., benzyl; --CH.sub.2 CH.sub.2 COR.sub.2 wherein R.sub.2 is OH or imidazol-1-yl; --CH.sub.2 CH.sub.2 C(O)CH.sub.2 COOR.sub.1 ' where R.sub.1 ' is an ester, e.g., p-nitrobenzyl; and R', R" and R'" are C.sub.1 -C.sub.4 alkyl, aryl or aralkyl; are converted to 1-carba(dethia)cephalosporin antibiotics. Preferably, R is phenoxy and the 1-silyl group is dimethyl-t-butylsilyl. Also provided is 3.beta.-phenoxyacetylamino-4.beta.-(2-carboxyethyl)azetidinone, likewise useful in the preparation of 1-carbacephalosporin antibiotics.
该文献描述了一类Azetidinone-2中间体,其化学式为##STR1## 其中R为苯基,苯氧基或噻吩基,R1为--CH.dbd.CH--COOR1',其中R1'为酯基,例如苄基;--CH2CH2COR2,其中R2为OH或咪唑-1-yl;--CH2CH2C(O)CH2COOR1',其中R1'为酯基,例如对硝基苄基;R'、R"和R'"为C1-C4烷基、芳基或芳基烷基。这些中间体可用于合成1-卡巴(德硫)头孢菌素类抗生素。在这些中间体中,最好选择R为苯氧基,并且1-硅基团为二甲基-叔丁基硅基。此外,文献还提供了3β-苯氧乙酰氨基-4β-(2-羧乙基)氮杂环戊酮,同样可用于制备1-卡巴头孢菌素类抗生素。