Process for preparing the antiviral agent [1S-(1alpha,3 alpha,4beta)]-2-amino-1,9-dihydro-9-[4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-6H-purin-6-one
申请人:——
公开号:US20040192912A1
公开(公告)日:2004-09-30
Processes are disclosed for preparing the antiviral agent entecavir. A resin adsorption process for the isolation and purification of entecavir is also disclosed. Various intermediates useful in the preparation of entecavir are also disclosed.
Process for preparing the antiviral agent [1S-(1alpha, 3alpha, 4beta)]-2-amino-1,9-dihydro-9-[4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-6H-purin-6-one
申请人:Pendri R. Yadagiri
公开号:US20060106216A1
公开(公告)日:2006-05-18
Processes are disclosed for preparing the antiviral agent entecavir. A resin adsorption process for the isolation and purification of entecavir is also disclosed. Various intermediates useful in the preparation of entecavir are also disclosed.
Process for isolating the antiviral agent [1S-(1alpha, 3alpha, 4beta)]-2-amino-1,9-dihydro-9-[4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]-6H-purin-6-one
申请人:Bristol-Myers Squibb Company
公开号:EP2433941A1
公开(公告)日:2012-03-28
The invention refers to a method for isolating entecavir or an entecavir intermediate from a diluted mixture, the diluted mixture comprising entecavir and water or a mixture comprising an entecavir intermediate and other process reagents comprising:
(a) adsorbing the diluted mixture onto a hydrophobic resin bed;
(b) washing the resin bed with water to remove salt; and
(c) eluting the entecavir or entecavir intermediate from the resin bed with an organic solvent.
A fiber-reinforced composite material of the present invention is a fiber-reinforced composite material comprising: an epoxy resin cured product obtained by curing an epoxy resin composition and a reinforcing fiber, wherein the epoxy resin composition comprises an epoxy resin (A) and a curing agent (B); 10 to 80% by mass of the curing agent (B) is 1,2,4-cyclohexanetricarboxylic acid-1,2-anhydride; and the reinforcing fiber comprises one or more selected from the group consisting of a carbon fiber, an aramid fiber, and a boron fiber.
A fiber-reinforced composite material of the present invention is a fiber-reinforced composite material comprising: an epoxy resin cured product obtained by curing an epoxy resin composition and a reinforcing fiber, wherein the epoxy resin composition comprises an epoxy resin (A) and a curing agent (B); 10 to 80% by mass of the curing agent (B) is 1,2,4-cyclohexanetricarboxylic acid-1,2-anhydride; and the reinforcing fiber comprises one or more selected from the group consisting of a carbon fiber, an aramid fiber, and a boron fiber.