A catalyst system, which comprises: a) a source of a Group VIII metal; b) a phosphine having an aromatic substituent which contains an imino nitrogen atom; c) a source of protons; and d) a tertiary amine.
Process for preparing a 2-(2-amino-1,6-dihydro-6-oxo-purin-9-yl)methoxy-1,3-propanediol derivative
申请人:Syntex (U.S.A.) Inc.
公开号:US06215017B1
公开(公告)日:2001-04-10
Intermediates of Formula (III)
wherein Y1 is acyloxy, wherein acyl is of the formula R—C(O)—, wherein R is alkyl of 1-6 carbon atoms, Y2 is aralkyloxy, and Z is benzoyloxy or acyloxy, wherein acyl is as defined above.
Intermediates of formula (III) are useful in a novel process for preparing the mono-L-valine ester of 2-(2-amino-1,6-dihydro-6-oxo-purin-9-yl)methoxy-1,3-propanediol (ganciclovir). The mono-L-valine ester of ganciclovir and its pharmaceutically acceptable salts are of value as antiviral agents with improved absorption.