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A solution of 9.26 g (42.4 mmol) of 3-chloro-4-trifluoromethoxy-phenylamine and 4.39 ml (42.4 mmol) of 2,6-lutidine in 50 ml of toluene was treated slowly with 7.30 ml (42.4 mmol) of tert-butyl 3-bromopropionate and stirred 2 days at reflux temperature. The reaction was then partitioned between aqueous 10% KHSO4 and EtOAc (3×). The organic phases were washed with 10% NaCl, dried over Na2SO4 evaporated and purified by flash silica gel column (n-heptane:EtOAc 9:1) to yield 9.59 g (60%) of the title compound as brown liquid. MS: 339 (M+, Cl).

1. temperatureat reflux temperature
2. customThe reaction was then partitioned between aqueous 10% KHSO4 and EtOAc (3×)
3. washThe organic phases were washed with 10% NaCl
4. dry with materialdried over Na2SO4
5. customevaporated
6. custompurified by flash silica gel column (n-heptane:EtOAc 9:1)