[EN] PROCESS FOR THE EPIMERIZATION OF ATOVAQUONE ISOMER, ATOVAQUONE INTERMEDIATES AND MIXTURE THEREOF [FR] PROCÉDÉ D'ÉPIMÉRISATION D'UN ISOMÈRE D'ATOVAQUONE, D'INTERMÉDIAIRES D'ATOVAQUONE ET DE LEUR MÉLANGE
Late-Stage C–H Alkylation of Heterocycles and 1,4-Quinones via Oxidative Homolysis of 1,4-Dihydropyridines
作者:Álvaro Gutiérrez-Bonet、Camille Remeur、Jennifer K. Matsui、Gary A. Molander
DOI:10.1021/jacs.7b05899
日期:2017.9.6
heterocyclic bases and 1,4-quinones. DHPs are readily prepared from aldehydes, and considering that aldehydes normally require harsh reaction conditions to take part in such transformations, with mixtures of alkylated and acylated products often being obtained, this net decarbonylative alkylation approach becomes particularly useful. The present method takes place under mild reaction conditions and requires
PROCESS FOR THE EPIMERIZATION OF ATOVAQUONE ISOMER, ATOVAQUONE INTERMEDIATES AND MIXTURE THEREOF
申请人:Zhu Fuqiang
公开号:US20110144347A1
公开(公告)日:2011-06-16
Provided is a process for the epimerization of the cis isomer of atovaquone, atovaquone intermediates and isomeric mixtures thereof into their corresponding trans-isomers resulting in higher yield of pure atovaquone.
The present invention relates to two novel and stable crystalline forms of atovaquone, to processes for their preparation and to pharmaceutical compositions comprising them. The present invention also provides crystalline particles of atovaquone having a specific surface area of from about 0.7 m
2
/g to about 4 m
2
/g, methods for the manufacture of said crystalline particles and pharmaceutical compositions comprising said crystalline particles. The present invention further provides an improved and commercially viable process for preparation of atovaquone substantially free of its undesired isomeric impurity, namely cis-2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone.
Active agent delivery systems and methods for protecting and administering active agents
申请人:Mickle Travis
公开号:US20070232529A1
公开(公告)日:2007-10-04
The present invention relates to active agent delivery systems and more specifically to compositions that comprise amino acids, as single amino acids or peptides, covalently attached to active agents and methods for administering conjugated active agent compositions.
ACTIVE AGENT DELIVERY SYSTEMS AND METHODS FOR PROTECTING AND ADMINISTERING ACTIVE AGENTS
申请人:Mickle Travis
公开号:US20090253792A1
公开(公告)日:2009-10-08
The present invention relates to active agent delivery systems and more specifically to compositions that comprise amino acids, as single amino acids or peptides, covalently attached to active agents and methods for administering conjugated active agent compositions.