Patent ID: 6515142
Filing Date: 2003-02-04
Classification: C07C,C07D,Y02P

Abstract:
A process for preparing a compound of Formula (V) or a salt thereof: wherein R1 represents a protective group for a nitrogen atom and R3 represents a hydrogen atom, an aralkyl group, or an alkyl group having 1 to 6 carbon atoms, comprising:reacting a compound of Formula (III): â€ƒwith a compound of Formula (IVa) â€ƒin the presence of a base; wherein in Formula (III) R1 represents a protective group for a nitrogen atom and R3 represents a hydrogen atom, an aralkyl group, or an alkyl group having 1 to 6 carbon atoms; and wherein in Formula (IVa) X2 is a halogen atom; wherein the compound of formula (IVa) is obtained by a process comprising: halogenating a compound of formula (VII): â€ƒin an alkylnitrile solvent.