Triethylamine → Phosphoramidic dichloride, bis(2-chloroethyl)-

Temperature

-78 °C

Bis(2-chloroethyl)amine hydrochloride (6.3 g, 35 mmol), suspended in 80 mL dichloromethane, was cooled to −78° C. under argon and stirred. A solution of phosphoryl chloride (5.41 g, 35 mmol) in 10 mL dichloromethane, followed by a solution of triethylamine (3.53 g, 70 mmol) in 10 mL dichloromethane, was added slowly by syringe. Stirring was continued while the reaction mixture was allowed to warm to room temperature overnight. The reaction mixture was washed with 0.01N hydrochloric acid (3×25 mL), dried over magnesium sulfate, and concentrated under reduced pressure to give N,N-bis(2-chloroethyl)phosphoramidic dichloride as a light orange oil that solidified on standing (7.9 g, 87% yield). A 2.2 g aliquot of the crude N,N-bis(2-chloroethyl)phosphoramidic dichloride was purified by flash chromatography on a 12 g silica cartridge, eluting with a gradient of 100% hexane to 67% hexane/33% ethyl acetate over 10 minutes followed by 67% hexane/33% ethyl acetate for a further 10 minutes, to give 1.5 g pure N,N-bis(2-chloroethyl)phosphoramidic dichloride as a white solid after evaporation of the solvents. MS (ES): m/z=275 [C4H8Cl4NOP+NH4+].

1. additionwas added slowly by syringe
2. stirringStirring
3. temperatureto warm to room temperature overnight
4. washThe reaction mixture was washed with 0.01N hydrochloric acid (3×25 mL)
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated under reduced pressure

ORD record

ord-0564a3e87bcd46a1b585e59603e4028a

Source dataset

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07872134B2