C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 473/18 (2006.01) C07D 473/00 (2006.01)
Patent
CA 2278474
2-[(2-Amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy]ethyl N- [(benzyloxy)carbonyl]-L-valinate crystals showing diffraction X-ray peaks at least at diffraction angles (2.theta., CuK.alpha.-ray) of 15.3~, 21.3~, 23.8~ and 27.2~ when measured by powder X-ray diffractometry. These crystals are scarcely hygroscopic, have a high crystalline purity, contain little impurities and are useful as an intermediate of valacyclovir employed as an antiviral agent.
L'invention concerne des cristaux de 2-[(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)méthoxy]éthyl N-[(benzyloxy)carbonyl]-L-valinate présentant des crêtes de diffraction de rayons X au moins à des angles de diffraction (2.theta., Cuk.alpha.-rayon) de 15,3·, 21,3·, 23,8· et 27,2· mesurés par un méthode de mesure par diffraction des rayons X des poudres. Ces cristaux sont faiblement hygroscopiques, ils présentent une haute pureté cristalline, ils contiennent peu d'impuretés et sont utiles en tant qu'intermédiaire de valacyclovir employé comme agent antiviral.
Ineyama Takashi
Katayama Satoshi
Kishishita Akihiro
Nagashima Kazutaka
Takeda Hideo
Ajinomoto Co. Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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