Compounds of Formula XXX where Y is a bond can be prepared by reductive alkylation of the secondary amine of compound of Formula XXIX. The alkylation is conveniently carried out in two parts by (i) adding an aldehyde or ketone to a solution of a compound of Formula XXIX or a salt thereof in a suitable solvent such as DMF or THF in the presence of a base such as N,N-diisopropylethylamine.