1,4-Dioxane hydrochloride → 4-{2-[2-(Acetylamino)-1,3-thiazol-4-yl]ethyl}-2-fluorobenzyl hydrazinecarboxylate hydrochloride
Reaction equation
[NH:1]([C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][C:17]([CH2:20][CH2:21][C:22]2[N:23]=[C:24]([NH:27][C:28](=[O:30])[CH3:29])[S:25][CH:26]=2)=[CH:16][C:15]=1[F:31])=[O:11])[NH:2]C(OC(C)(C)C)=O.O1CCOCC1.[ClH:38]>ClCCl>[ClH:38].[NH:1]([C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][C:17]([CH2:20][CH2:21][C:22]2[N:23]=[C:24]([NH:27][C:28](=[O:30])[CH3:29])[S:25][CH:26]=2)=[CH:16][C:15]=1[F:31])=[O:11])[NH2:2]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a suspension of 4-{2-[2-(acetylamino)-1,3-thiazol-4-yl]ethyl}-2-fluorobenzyl tert-butyl hydrazine-1,2-dicarboxylate (147.0 mg, 0.325 mmol) in anhydrous dichloromethane (2 ml) was added 4M hydrogen chloride dioxane solution (2 ml). After stirring at room temperature for 2 hr, and the mixture was concentrated under reduced pressure. Ethyl acetate was added to the concentrated residue, and the mixture was concentrated again under reduced pressure. This operation was performed 3 times to remove hydrogen chloride gas azeotropically. The residue was suspended in a mixture of ethanol (2 ml) and ethyl acetate (8 ml) and filtered. The filtered product was washed twice with ethyl acetate, and dried under reduced pressure to give 4-{2-[2-(acetylamino)-1,3-thiazol-4-yl]ethyl}-2-fluorobenzyl hydrazinecarboxylate hydrochloride (129.1 mg, quantitative) as a white solid.