反应详情

To a 50 mL round-bottomed flask containing trans-2-chloro-N-(4-formyl-cyclohexyl)-5-trifluoromethyl-benzamide (Ex. 1 step 3) (1.0 g, 3.0 mmol) and 3-fluoroaniline (0.29 mL, 3.0 mmol) in dry DCM (25 mL) is added sodium triacetoxyborohydride (953 mg, 4.49 mmol) in three portions over 1-2 minutes. The suspension is stirred at RT for 1 hour. 1N sodium hydroxide (25 mL) is added and the mixture is stirred at RT for 20 min. The mixture is then diluted with DCM (50 mL) and the DCM layer separated and washed with 1M HCl (25 mL) and brine (15 mL), dried (MgSO4), filtered and evaporated to give a colourless solid. The crude product is redissolved in DCM, absorbed directly onto silica gel and columned on silica gel using a 50 g pre-packed column and eluted with 30% EtOAc/isohexane. Product is isolated as a colourless oil which is triturated with diether ether-isohexane to afford the title compound as colourless crystals. [MH+429.24].

1. stirringthe mixture is stirred at RT for 20 min
2. customthe DCM layer separated
3. washwashed with 1M HCl (25 mL) and brine (15 mL)
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. customevaporated
7. customto give a colourless solid
8. customabsorbed directly onto silica gel
9. washeluted with 30% EtOAc/isohexane
10. customProduct is isolated as a colourless oil which
11. customis triturated with diether ether-isohexane