Diastereoselective Phenol <i>p</i><i>ara</i>-Alkylation: Access to a Cross-Conjugated Cyclohexadienone en Route to Resiniferatoxin
作者:Tobias Ritter、Pablo Zarotti、Erick M. Carreira
DOI:10.1021/ol0480832
日期:2004.11.1
strategy is based on an unprecedented diastereoselective, intramolecular phenol para-alkylation to a cross-conjugatedcyclohexadienone. In the course of these synthetic studies we developed rapid access to a chiral nitrile possessing a quaternary stereocenter and disclose an unusual acetal rearrangement from a dioxane, which favors the corresponding dioxepane.
A green and efficient method for regioselective O-acylation of polyphenols has been developed. The acylation can be carried out in potassiumcarbonate/dimethyl sulphoxide system by utilizing the ‘inherent nucleophile’ via an intermolecular cooperative transesterification under mild condition. This method shows particular advantage in regioselective acylation of polyphenols bearing 2′,4′-dihydroxyacetophenone
APPLICATION OF COMBINATION OF POLYETHYLENE GLYCOL AND LOCAL ANESTHETIC IN NON-NARCOTIC ANALGESIA
申请人:Jenkem Technology Co., Ltd. (Tianjin)
公开号:EP3563873A1
公开(公告)日:2019-11-06
The invention discloses use of a conjugate of polyethylene glycol and a local anesthetic in non-anesthetic analgesia. A local anesthetic is prepared into a prodrug or a sustained release preparation, wherein a high molecular polymer such as polyethylene glycol in the prodrug is covalently bonded with a local anesthetic, and auxiliary materials with a sustained release effect in the sustained release preparation are non-covalently bonded to the local anesthetic. After administration, there is no anesthesia and analgesic effect before the release of the free local anesthetic. After the free local anesthetic is released, an analgesic effect is achieved. And the prodrug or the sustained-release preparation of the local anesthetic of the present invention releases the drug slowly, and renders the drug concentration kept stable and long-lasting in the effective concentration range of non-narcotic analgesia, and the long-acting non-anesthetic analgesic effect can be achieved while significantly reducing the clinical adverse reactions of local anesthetics and reducing the number of administrations. The effectiveness of the drug is greatly enhanced and the clinical application range of local anesthetics is expanded.