provided are processes for the preparation of the compound of the formula wherein r 1 , r 3 and r 4 are independently selected from the group consisting of hydrogen , halogen , hydroxyl , nitro , lower alkyl , lower alkoxy , carboxy , c 1 - c 6 trihaloalkyl , and cyano ; and r 2 is amino or lower alkyl . also provided are synthetic intermediates that are useful as intermediates in the preparation of the compound of the formula 1 .