in about 1 5 2 5 molar equivalents the product of formula iv may be isolated by customary work up procedures such as for example treatment with an acid e g hcl in a solvent e g ethyl acetate step 3 is a hydrolysis where the n boc protecting group is cleaved which may be accomplished by well known procedures an example would be acid hydrolysis where the compound of formula iv is treated with an acid such as for example trifluoroacetic acid and the like preferably in an organic solvent such as for example toluene xylene chlorobenzene dichlorobenzene and the like at temperatures ranging from ambient to about u2212 5 u00b0 c to about 20 u00b0 c the product may be extracted into the organic solvent and isolated by procedures well known to those skilled in the art the product of formula v may be converted it into an acid salt of formula vi such as oxalate tartarate citrate and the like by reacting with the appropriate acid e g oxalic acid tartaric acid and citric acid in step 4 compound ix may be prepared from compound viii in step 5 by known n oxidation procedures generally a peroxide such as h 2 o 2 or an.