Molecular recognition: .alpha.-cyclodextrin and penicillin V inclusion complexation
摘要:
Specific molecular recognition between alpha-cyclodextrin (1) and a beta-lactam antibiotic, penicillin V (2), was systematically determined. A stable 1:1 inclusion complex was established in the solid state, gaseous phase, and solution. The distinct structure of this inclusion complex was rigorously elucidated by FT-IR, FAB-MS, CP/MAS solid-state C-13 NMR, and 500-MHz H-1 NMR. Based on strictly determined H-1 NMR data, a time-averaged conformation of the alpha-CD-penicillin V inclusion complex was proposed, which was supported by CPK model studies and the intermolecular NOE results. Moreover, alpha-cyclodextrin exhibited significant catalytic activity toward the hydrolysis of penicillin V in weakly alkaline solution. These findings imply that the initial molecular recognition and the concomitant molecular association are essential in a biomimetic process.
Process for the preparation of esters of N-blocked penicillin acids
申请人:Glaxo Laboratories Limited
公开号:US03960843A1
公开(公告)日:1976-06-01
A process is described for the preparation of esters of N-blocked amino acids (such as penicillins or cephalosporins) wherein the amino acid or a salt thereof is reacted with a primary amine and nitrosating agent.
Molecular recognition: .alpha.-cyclodextrin and penicillin V inclusion complexation
作者:Zhihong Helena Qi、Vivien Mak、Luis Diaz、David M. Grant、Ching Jer Chang
DOI:10.1021/jo00004a037
日期:1991.2
Specific molecular recognition between alpha-cyclodextrin (1) and a beta-lactam antibiotic, penicillin V (2), was systematically determined. A stable 1:1 inclusion complex was established in the solid state, gaseous phase, and solution. The distinct structure of this inclusion complex was rigorously elucidated by FT-IR, FAB-MS, CP/MAS solid-state C-13 NMR, and 500-MHz H-1 NMR. Based on strictly determined H-1 NMR data, a time-averaged conformation of the alpha-CD-penicillin V inclusion complex was proposed, which was supported by CPK model studies and the intermolecular NOE results. Moreover, alpha-cyclodextrin exhibited significant catalytic activity toward the hydrolysis of penicillin V in weakly alkaline solution. These findings imply that the initial molecular recognition and the concomitant molecular association are essential in a biomimetic process.