[CH3:1][C:2]1([CH3:9])[CH2:7][CH2:6][NH:5][C:4](=[O:8])[CH2:3]1.F[B-](F)(F)F.[CH3:15][O+](C)C>>[CH3:1][C:2]1([CH3:9])[CH2:3][C:4]([O:8][CH3:15])=[N:5][CH2:6][CH2:7]1A sample of the title compound of EXAMPLE 168 (636 mg, 5 mmol) was reacted with trimethyloxonium tetrafluoroborate (890 mg, 6 mmol) by the method of EXAMPLE 26 to yield, after chromatography, 550 mg (78%) of the title material.
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