[Cl:1][CH2:2][C:3](Cl)=[O:4].Cl.[NH:7]1[CH2:14][S:13][CH2:12][C@H:8]1[C:9]([NH2:11])=[O:10].FC(F)(F)C(OC(=O)C(F)(F)F)=O>N1C=CC=CC=1.ClCCl.C(N(CC)CC)C>[ClH:1].[NH:7]1[CH2:14][S:13][CH2:12][C@H:8]1[C:9]([NH2:11])=[O:10].[Cl:1][CH2:2][C:3]([N:7]1[C@H:8]([C:9]#[N:11])[CH2:12][S:13][CH2:14]1)=[O:4]
L-thioprolineamide hydrochloride was synthesized according to the process described in the literature (Ashworth et. al., Bioorg. Med. Chem. Lett., Vol. 6, pp. 2745–2748, 1996). 2.36 ml of chloroacetyl chloride was added to a solution of 150 ml of dichloromethane containing 5.00 g of L-thioprolineamide hydrochloride thus obtained and 8.67 ml of triethylamine under ice-cooling, and the mixture was stirred at the same temperature for 1 hour. To the reaction mixture was added a dichloromethane solution containing 4.8 ml of pyridine and 8.4 ml of trifluoroacetic anhydride, and the mixture was further stirred at room temperature for 1 hour. The reaction mixture was washed with an aqueous 10% HCl solution and water, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure, and subsequently, the residue was crystallized from ether to obtain 4.82 g of (R)-3-chloroacetyl-4-cyanothiazolidine as yellow-brownish crystals.
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