Vinylidene chloride → HCID 58966440, compound

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Reaction Steps

To the product from step A (640 g) in methyl tert-butyl ether (4.3 L) was added 1N sodium hydroxide (3.4 L). The mixture was stirred until 2 clear layers formed. The organics were washed with brine, dried over sodium sulfate, filtered, and concentrated to the free amine (460 g). The free amine (460 g, 1.81 mol) was taken into 1,1-dichloroethene (4.3 L) and 3,5-bis(trifluoromethyl)benzaldehyde (438 g, 1.81 mol) was added. The mixture was cooled in an ice-water bath and NaBH(CH3CO2)3 (767 g, 3.62 mol) was added. The mixture was stirred for 16 hours at which point LC analysis revealed complete reaction. Saturated aq potassium carbonate was added until pH 8 was reached. Added water (1 L) and filtered undissolved salts. The layers were separated and the aqueous layer was washed with 1,1-dichloroethene (2 L). The combined organics were washed with brine, dried over sodium sulfate, filtered, and concentrated (880 g product, >95% yield). 1H-NMR of HCl salt (CD3OD)8.23 (s, 2H), 8.09 (s, 1H), 7.98 (s, 1H), 7.93 (d, 8.3 Hz, 1H), 7.67 (d, 8.3 Hz, 1H), 4.61 (s, 2H), 4.56 (s, 2H). Mass Spec (ESI); M+1=480.1

Provenance & Evidence