4-chloro-2,5-difluorobenzaldehyde

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-chloro-2,5-difluorobenzaldehyde (20.6 g, 105.0 mmol) and hydrazine hydrate (77.2 mL, 1575.2 mmol, 15 eq) in n-butanol (35 mL) was stirred at 140° C. for 3 days. The mixture was cooled to room temperature and poured into ice water (750 mL). The mixture was stirred vigorously for 2 h, and the orange solid was filtered. The filtrate was extracted with EtOAc (3×250 mL), and the combined organic phases were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The residue was combined with the orange solid and then purified by MPLC (Biotage®, gradient elution 25% EtOAc/hexane) to give 2.81 g (16%) of a white solid. 1H-NMR (300 MHz, DMSO-d6) 13.3 (broad s, 1H), 8.09 (s, 1H), 7.80 to 7.76 (m, 2H); ES-MS m/z 171.2/173.2 [M+H]+, RT (min) 3.02. The mixture was cooled to room temperature The mixture was stirred vigorously for 2 h the orange solid was filtered The filtrate was extracted with EtOAc (3×250 mL) the combined organic phases were washed with brine dried over Na2SO4 filtered concentrated in vacuo purified by MPLC (Biotage®, gradient elution 25% EtOAc/hexane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Chloro-2,5-difluorobenzaldehyde (1 g, 5.66 mmol), morpholine (0.490 ml, 5.66 mmol) and sodium triacetoxyborohydride (1.741 g, 8.21 mmol) were mixed in dichloroethane (17 ml). The mixture was stirred at ambient temperature under argon atmosphere for 3 days. NaHCO3 (aq., sat, 25 ml) was added. The mixture was extracted with dichloromethane (×3). The combined organic phase were dried over MgSO4 filtered and concentrated in vacuo to give 4-(4-chloro-2,5-difluorobenzyl)morpholine (0.600 g, 43%) as a liquid. The mixture was extracted with dichloromethane (×3) The combined organic phase were dried over MgSO4 filtered concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Chloro-2,5-difluorobenzaldehyde (0.177 g, 1.0 mmol) and (3S,5S)-3,5-dimethylmorpholine (0.167 g, 1.10 mmol) were dissolved in dichloromethane (10 mL). Sodium triacetoxyborohydride (0.307 g, 1.45 mmol) was added and the mixture was stirred under argon atmosphere at RT for 20 h. The mixture was diluted with dichloromethane and washed with NaHCO3 (aq). The organic phase was dried (MgSO4) and evaporated. The residue was purified by column chromatography on silica eluting with gradients of ammonia in methanol and dichloromethane. The fractions containing product were pooled and evaporated to give (3S,5S)-4-(4-chloro-2,5-difluorobenzyl)-3,5-dimethylmorpholine (0.118 g, 43%) as a liquid. washed with NaHCO3 (aq) The organic phase was dried (MgSO4) evaporated The residue was purified by column chromatography on silica eluting with gradients of ammonia in methanol and dichloromethane The fractions containing product evaporated

Conditions: temp:0.00; pressure:0.00; stir: