luoro-nitrobenzene of formula: ##STR27## in the presence of ann-butyl lithium derivative, or in the presence of a base such as sodium hydride, sodium amide, triethylamine, or K.sub.2 CO.sub.3 in dimethyl sulphoxide, to form a nitro ester of formula: ##STR28## which can then be reduced to the amino ester of formula(VII) catalytically, for instance using hydrogen over palladium on charcoal, or chemi