反应详情

Combine 2-chloro-6-(1-cyclopropylmethyl-piperidin-4-yloxy)-pyridine (preparation 56, 480 mg, 1.80 mmol), benzophenone imine (391 mg, 2.16 mmol), BINAP (67 mg, 0.11 mmol), pd2(dba)3 (33 mg, 0.036 mmol), sodium t-butoxide (242 mg, 2.52 mmol) and toluene (8 mL) and heat at 100° C. for 14 hr. Quench the reaction with saturated NaHCO3 solution, extract with ethyl acetate three times. Combine the organic layers, dry over Na2SO4, filter and concentrate under reduced pressure to give a residue. Dissolve the residue in THF (10 mL), add 5N HCl (1.0 mL) and stir for 30 min. Dilute the mixture with 0.1N HCl solution, extract twice with ethyl acetate-hexanes (1:2). Keep the aqueous layer and adjust pH>11 with 5N NaOH solution, extract with methylene dichloride three times. Combine the organic layers, dry over Na2SO4, filter and concentrate to give a residue. Chromatography (silica gel) eluting with 7% 2M NH3-methanol in methylene dichloride provides 310 mg (70%) of the title compound as a white solid: mass spectrum (ion spray): m/z=248.1 (M+1); 1H NMR (CDCl3, ppm): 7.23 (t, 1H), 5.95 (pseudo-t, 2H), 4.81 (m, 1H), 4.14 (s, br, 2H), 2.76 (m, 2H), 2.26 (m, 2H), 2.18 (d, 2H), 1.92 (m, 2H), 1.71 (m, 2H), 0.80 (m, 1H), 0.44 (m, 2H), 0.00 (m, 2H).

1. customQuench
2. customthe reaction with saturated NaHCO3 solution
3. extractionextract with ethyl acetate three times
4. dry with materialCombine the organic layers, dry over Na2SO4
5. filtrationfilter
6. concentrationconcentrate under reduced pressure
7. customto give a residue
8. extractionextract twice with ethyl acetate-hexanes (1:2)
9. extractionextract with methylene dichloride three times
10. dry with materialCombine the organic layers, dry over Na2SO4
11. filtrationfilter
12. concentrationconcentrate
13. customto give a residue
14. washChromatography (silica gel) eluting with 7% 2M NH3-methanol in methylene dichloride