Cl[C:2]1[C:7]([O:8][CH2:9][CH2:10][O:11]C2CCCCO2)=[CH:6][CH:5]=[CH:4][N:3]=1.[OH:18][CH2:19][C@@H:20]1[CH2:24][CH2:23][CH2:22][N:21]1[CH3:25].CC(C)([O-])C.[K+].C(O)(C)(C)C>C1(C)C=CC=CC=1>[CH3:25][N:21]1[CH2:22][CH2:23][CH2:24][C@H:20]1[CH2:19][O:18][C:2]1[C:7]([O:8][CH2:9][CH2:10][OH:11])=[CH:6][CH:5]=[CH:4][N:3]=1A solution of 2-chloro-3-[2-(tetrahydro-2H-pyran-2-yloxy)ethoxy]pyridine (from Example 4; 100 mg, 0.39 mmol), (S)-(−)-2-hydroxymethyl-1-methylpyrrolidine (69 μl, 0.58 mmol) and 1.0 M potassium tert-butoxide in tert-butanol (0.8 mL, 0.80 mmol) in 4 mL of toluene was heated at 100° C. for 1 day. The organic phase was washed with 3×2 mL of water and 2 mL of brine. The organic phase was shaken at 50° C. with 4 mL of 2.0 M acetic acid for 2 days. The aqueous phase was washed with 3×3 mL of ethyl acetate, made basic by addition of potassium hydroxide, saturated with sodium chloride and extracted with 3×2 mL of ethyl acetate. The organic phase was dried (MgSO4) and concentrated under reduced pressure to give 78 mg (0.31 mmol, 79%) of the title compound as a colorless oil. LC-UV purity 95%. MS m/z 253 (M+1)+, calc. 253 (M+1)+.
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