Trifluoroacetic acid → Diethyl (4-{[4-{[3-(methylsulfonyl)benzyl]amino}-5-(trifluoromethyl)pyrimidin-2-yl]amino}benzyl)phosphonate

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Reaction Steps

Reaction of 2,4-dichloro-5-(trifluoromethyl)pyrimidine XL with commercially available 1-[3-(methylsulfonyl)phenyl]methanamine and diisopropylethylamine at 0° C. overnight affords a mixture of 2-chloro-N-[3-(methylsulfonyl)benzyl]-5-(trifluoromethyl)pyrimidin-4-amine and 4-chloro-N-[3-(methylsulfonyl)benzyl]-5-(trifluoromethyl)pyrimidin-2-amine XLIVa/XLIVb. The crude mixture was crystallized from methylene chloride to afford a sample of the pure, undesired 2-substituted isomer XLIVb. The mother liquors were chromatographed over silica gel eluting with 1:1 hexane:ethyl acetate to yield a further pure sample of the 2-substituted isomer plus a sample of the desired 2-chloro-N-[3-(methylsulfonyl)benzyl]-5-(trifluoromethyl)pyrimidin-4-amine XLIVa. Reaction of this latter isomer with anilines such as diethyl (4-aminobenzyl)phosphonate in the presence of TFA and TFE under microwave irradiation yields the desired product (e.g. diethyl (4-{[4-{[3-(methylsulfonyl)benzyl]amino}-5-(trifluoromethyl)pyrimidin-2-yl]amino}benzyl)phosphonate, Ex. 25).

Provenance & Evidence