2,2-Dimethylsuccinic anhydride → 4-[4-(4',5'-Difluoro-2'-methoxy-biphenyl-4-yloxymethyl)-indol-1-yl]-2,2-dimethyl-4-oxo-butyric acid

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4-[4-(4′,5′-Difluoro-2′-methoxy-biphenyl-4-yloxymethyl)-indol-1-yl]-2,2-dimethyl-4-oxo-butyric acid was synthesized by a procedure similar to 4-[4-(4′,5′-difluoro-2′-methoxy-biphenyl-4-yloxymethyl)-indol-1-yl]-4-oxo-butyric acid from starting materials 4-(4′,5′-difluoro-2′-methoxy-biphenyl-4-yloxymethyl)-1H-indole and 2,2-dimethyl-succinic anhydride to yield the product as a white solid (13 mg, 27%). LC-MS (ES) calculated for C28H25F2NO5, 493.2; found m/z 494 [M+H]+.

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