Hydrochloric Acid → HCID 11670915, compound

Participants

Reaction Steps

3-[[2-[[Bis[bis(2-chloroethyl)amino]phosphinyl]oxy]ethyl]sulfonyl]-N-tert-butoxycarbonyl-L-alanine, 1.82 g (2.91 mmol), was dissolved in 18 mL ethyl acetate, and to this solution was added hydrogen chloride, 1.75 mL of 2 M solution in diethyl ether (3.5 mmol); and the resulting mixture stirred under nitrogen overnight at room temperature. HPLC analysis of the reaction mixture showed that the reaction was incomplete (20.8% product), so an additional 0.9 equivalents of hydrogen chloride solution was added and the reaction mixture stirred for an additional 4 days, resulting in the formation of a slurry. HPLC analysis of the reaction mixture showed 99.7% product and 0.3% starting material. The slurry was filtered under nitrogen, washed with ethyl acetate, and dried under nitrogen for 3 hours to give 3-[[2-[[bis[bis(2-chloroethyl)amino]phosphinyl]oxy]ethyl]sulfonyl]-L-alanine, compound 70A, as the hydrochloride salt, off-white solid, 0.90 g (55% yield). HPLC analysis of the product showed a purity of 99.7%. 1H NMR: δ 8.50-9.10 (bs, 3H), 4.43 (m, 1H), 4.32 (m, 2H), 3.93-3.97 (m, 1H), 3.70-3.80 (m, 11H), 3.34 (m, 8H). 13C NMR: δ 168.2, 58.0, 57.9, 53.8, 53.7, 53.0, 48.3, 48.3, 47.1, 42.3. 31P NMR: δ 17.5 (s, 1P). Mass spectrum: m/z 526 [C13H26Cl4N3O6PS+H]+.

Provenance & Evidence