convenient and high yielding approach for the deprotection and scavenging of the p-methoxybenzyl (PMB) group in PMB ethers and PMB esters was developed using POCl3 as the reagent. 4-Methoxybenzyl chloride, a starting material used for the preparation of PMB ethers and esters was regenerated in the deprotection step. This mild and selective procedure tolerates several acid sensitive functional groups.
An Improved Synthesis of Certain 3-Ethoxycarbonylcoumarins
作者:Eugene R. Bissell
DOI:10.1055/s-1982-29968
日期:——
4-HYDROXYQUINOLINE-3-CARBOXAMIDES AND HYDRAZIDES AS ANTIVIRAL AGENTS
申请人:Pharmacia & Upjohn Company LLC
公开号:EP1042295B1
公开(公告)日:2005-09-07
Lead Optimization of 3-Carboxyl-4(1<i>H</i>)-Quinolones to Deliver Orally Bioavailable Antimalarials
作者:Yiqun Zhang、Julie A. Clark、Michele C. Connelly、Fangyi Zhu、Jaeki Min、W. Armand Guiguemde、Anupam Pradhan、Lalitha Iyer、Anna Furimsky、Jason Gow、Toufan Parman、Farah El Mazouni、Margaret A. Phillips、Dennis E. Kyle、Jon Mirsalis、R. Kiplin Guy
DOI:10.1021/jm201642z
日期:2012.5.10
Malaria is a protozoal parasitic disease that is widespread in tropical and subtropical regions of Africa, Asia, and the Americas and causes more than 800,000 deaths per year. The continuing emergence of multidrug-resistant Plasmodium falciparum drives the ongoing need for the development of new and effective antimalarial drugs. Our previous work has explored the preliminary structural optimization of 4(1H)-quinolone ester derivatives, a new series of antimalarials related to the endochins. Herein, we report the lead optimization of 4(1H)-quinolones with a focus on improving both antimalarial potency and bioavailability. These studies led to the development of orally efficacious antimalarials including quinolone analogue 20g, a promising candidate for further optimization.
BISSELL, E. R., SYNTHESIS, BRD, 1982, N 10, 846-848