反应详情

A mixture of 3-[4-(4-chlorobenzyl)-5-(4H-1,2,4-triazol-3-yl)-1,3-thiazol-2-yl]-2-methylpyrazolo[1,5-a]pyridine-5-carbaldehyde (0.0563 g, 0.109 mmol), tert-butyl 1-piperazinecarboxylate (60.8 mg, 0.326 mmol) and acetic acid (0.0800 mL, 1.41 mmol) in dry methylene chloride (10 mL) was stirred at rt for 15 min. Sodium triacetoxyborohydride (69.1 mg, 0.326 mmol) was added and the mixture was stirred at rt for 15 hours. The mixture was washed with saturated NaHCO3 solution and the aqueous layer was extracted with DCM. The DCM extract was washed with water, brine, dried over Na2SO4, filtered and evaporated to give a crude product which was purified by column chromatography on silica gel column using MeOH/DCM (0/100 to 5/95) to give solid product (0.0464 g, yield 70.5%). LCMS: (FA) ES+ 605, 607; ES− 603, 605. 1H NMR (400 MHz, CDCl3 and d4-methanol) δ: 8.23-8.25 (d, J=7.03 Hz, 1H), 8.20 (s, 1H), 7.94 (s, 1H), 7.29-7.31 (d, J=8.28 Hz, 2H), 7.15-7.17 (d, J=8.53 Hz, 2H), 6.86-6.89 (dd, J=7.28, 1.76 Hz, 1H), 4.53 (s, 2H), 3.45 (s, 2H), 3.33-3.36 (m, 4H), 2.62 (s, 3H), 2.35 (s, br, 4H), 1.37 (s, 9H).

1. stirringthe mixture was stirred at rt for 15 hours
2. washThe mixture was washed with saturated NaHCO3 solution
3. extractionthe aqueous layer was extracted with DCM
4. extractionThe DCM extract
5. washwas washed with water, brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. customevaporated
9. customto give a crude product which
10. customwas purified by column chromatography on silica gel column