Novel z-valacyclovir crystals

C - Chemistry – Metallurgy – 07 – D

Patent

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Details

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.

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