[NH2:1][C:2]1[C:3]([C:9]([OH:11])=O)=[N:4][C:5]([CH3:8])=[CH:6][CH:7]=1.[NH:12]1[CH2:15][CH2:14][CH2:13]1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CN1CCOCC1>C1COCC1>[NH2:1][C:2]1[C:3]([C:9]([N:12]2[CH2:15][CH2:14][CH2:13]2)=[O:11])=[N:4][C:5]([CH3:8])=[CH:6][CH:7]=1To a stirred mixture of 3-amino-6-methylpicolinic acid (525 mg, 2.17 mmol) and azetidine (124 mg, 146 μl, 2.17 mmol) at r.t. in THF (15 ml) under an argon atmosphere were added HATU (1.65 g, 4.35 mmol) and 4-methylmorpholine (719 μl, 6.52 mmol). The mixture was heated to 70° C. overnight, then cooled to r.t. and concentrated. The crude product was purified by silica gel chromatography using a n-heptane/EtOAc gradient to give the title compound (272 mg, 65%) as off-white solid.
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