Ring Enlargement of the β-Lactam Nucleus of Penicillins
摘要:
AbstractUsing penicillins as starting materials, a general synthetic route to the bicyclic compounds 7 has been established; they formally result from a ring enlargement of the ß‐lactam with insertion of one nitrogen atom. The key‐step of the procedure is a very mild Lossen rearrangement of hydroxamic acids intermediates upon treatment with N,N‐diethylaminopropyne.
THE USE OF LIPOPHILIC BETA-LACTAM ANTIBIOTICS AND CARBOXYLATE ESTERS FOR THE TREATMENT OF BACTERIAL INFECTIONS WITHIN CITRUS AND OTHER PLANT SPECIES
申请人:BOARD OF REGENTS OF THE NEVADA SYSTEM OF HIGHER EDUCATION ON BEHALF OF NEVADA
公开号:US20200230114A1
公开(公告)日:2020-07-23
Disclosed is method for converting a beta-lactam antibiotic into a “masked” beta-lactam antibiotic to permit it to cross the waxy cuticle of a plant and then subsequently unmasking the beta-lactam and converting it into an active beta-lactam antibiotic in the plant phloem. The method permits the use of beta-lactam antibiotics to be used to treat a variety of plant bacterial infections that was not previously possible because the native beta-lactam antibiotics cannot cross the waxy cuticle of plants. In one embodiment the disclosure finds special use in the treatment of bacterial infection of citrus plants with Huanglongbing disease.