[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF CHLORO METHYL CEPHEM DERIVATIVES [FR] PROCEDE AMELIORE DE PREPARATION DE DERIVES DE CHLOROMETHYLCEPHEME
Copper-assisted displacement reaction of nonactivated lodoarenes with arenesulfinates. Convenient alternative synthesis of unsymmetrical diaryl sulfones
作者:Hitomi Suzuki、Hajime Abe
DOI:10.1016/0040-4039(95)01095-y
日期:1995.8
In the presence of copper(I) iodide in hot N,N-dimethylformamide (DMF), a variety of functionalized iodoarenes undergo nucleophilic displacement reaction with sodium arenesulfinates to give the corresponding unsymmetrical diaryl sulfones in moderate to good yields.
Copper-Mediated Nucleophilic Displacement Reactions of 1-Haloalkynes. Halogen-Halogen Exchange and Sulfonylation
作者:Hajime Abe、Hitomi Suzuki
DOI:10.1246/bcsj.72.787
日期:1999.4
reagents for the nucleophilicdisplacement of 1-haloalkynes. Copper(I) iodide smoothly transforms 1-bromoalkynes (2) into 1-iodoalkynes (1) which, on further treatment with copper(II) bis(arenesulfinate), are readily converted to the corresponding alkynyl aryl sulfones (4). The kinetic data of the halogen exchange between (4-chlorophenyl)ethynyl bromide (2d) and CuI have shown that the reaction is linearly
已发现一些铜 (I) 和 (II) 化合物可用作 1-卤代炔烃的亲核置换的有效试剂。碘化铜 (I) 顺利地将 1-溴炔烃 (2) 转化为 1-碘代炔烃 (1),在用双 (芳烃亚磺酸盐) 铜 (II) 进一步处理后,很容易转化为相应的炔基芳基砜 (4)。(4-氯苯基) 乙炔基溴 (2d) 和 CuI 之间的卤素交换动力学数据表明,该反应线性依赖于两种化合物的浓度。已经提出了一种涉及 1-卤代炔烃和铜 (I) 盐之间单电子转移的机械途径,用于目前在炔碳原子上的铜辅助卤素交换反应。
[EN] PROCESS FOR THE CONVERSION OF PENAM RING SYSTEM TO CEPHAM RING SYSTEM<br/>[FR] PROCEDE POUR LA CONVERSION D'UN SYSTEME A NOYAU PENAME EN UN SYSTEME A NOYAU CEPHAME
申请人:ORCHID CHEMICALS & PHARM LTD
公开号:WO2004000848A1
公开(公告)日:2003-12-31
The present invention relates to a new process for the preparation of cephalosporin derivative of formula (I) wherein R1 represents p-methoxybenzyl, p-nitrobenzyl, o-chlorobenzyl or diphenylmethyl; R2 represents CH3 or CR?aRbCOORc¿ where R?a and Rb¿ independently represent hydrogen or methyl and Rc represents hydrogen or (C¿1?-C6) alkyl; R3 represents hydrogen, acyl, phenacyl, formyl or trityl group.