Formaldehyde → Diethyl P-[[[(4-methylphenyl)sulfonyl]oxy]methyl]phosphonate

Temperature

87 °C

In a reactor containing an inert atmosphere, e.g., nitrogen, a mixture of diethyl phosphite (0.80 kg), paraformaldehyde (0.22 kg), and triethylamine (0.06 kg) in toluene (0.11 kg) is heated at 87° C. for about 2 hours, then refluxed for about 1 hour, until the reaction is complete as monitored by TLC showing a trace or no detectable diethyl phosphite. During the reaction, the inert atmosphere is maintained. Toluene is necessary to moderate the reaction, which may otherwise explode. Reaction completion is optionally confirmed by 1H NMR (diethyl phosphite peak at δ 8.4-8.6 ppm no longer detected). The solution is cooled to about 1° C. (typically about -2 to 4° C.) and p-toluenesulfonyl chloride (1.0 kg) is added and then triethylamine (0.82 kg) at about 5° C. is slowly added (exothermic addition) while maintaining the temperature at no more than about 10° C. (typically 0 to 10° C.). The resulting mixture is warmed to 22° C. and stirred for at least about 5 hours (typically about 4.5 to 6.0 hours), until the reaction is complete as shown by TLC (trace or no p-toluenesulfonyl chloride detectable) and optionally confirmed by 1H NMR (p-toluenesulfonyl chloride doublet at δ 7.9 ppm no longer detected). The solids are removed by filtration and washed with toluene (0.34 kg). The combined washings and filtrate are washed either twice with water (1.15 kg per wash), or optionally with a sequence of water (1.15 kg), 5% aqueous sodium carbonate (3.38 kg), and then twice with water (1.15 kg). After each wash, the reactor contents are briefly agitated, allowed to settle and the lower aqueous layer is then discarded. If the reaction results in an emulsion, brine (0.23 kg of water containing 0.08 kg NaCl) may be added to the first organic/water mixture, followed by agitating the reactor contents, allowing the solids to settle, discarding the lower aqueous layer, adding 1.15 kg water, agitating, allowing solids to settle and again discarding the lower aqueous layer. The organic phase is distilled in vacuo at no more than 50° C. (to LOD at 110° C. of no more than 10% and water content, by KF titration, no more than 0.3%), affording a yield of about 60-70% of the title compound as an oil of about 85-95% purity, exclusive of toluene.

1. additionIn a reactor containing an inert atmosphere, e.g., nitrogen
2. temperaturerefluxed for about 1 hour, until the reaction
3. customDuring the reaction
4. temperaturethe inert atmosphere is maintained
5. customthe reaction, which
6. customReaction completion
7. additionis added
8. addition(exothermic addition)
9. temperaturewhile maintaining the temperature at no more than about 10° C. (typically 0 to 10° C.)
10. temperatureThe resulting mixture is warmed to 22° C.
11. customThe solids are removed by filtration
12. washwashed with toluene (0.34 kg)
13. washThe combined washings and filtrate are washed either twice with water (1.15 kg per wash)
14. stirringAfter each wash, the reactor contents are briefly agitated
15. customIf the reaction results in an emulsion, brine (0.23 kg of water containing 0.08 kg NaCl)
16. stirringby agitating the reactor contents
17. stirringagitating
18. distillationThe organic phase is distilled in vacuo at no more than 50° C. (to LOD at 110° C. of no more than 10% and water content, by KF titration, no more than 0.3%)

ORD record

ord-9668a4a2f55c44bebc764518c475cc23

Source dataset

uspto-grants-1999_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05922695