Dimethyl methylphosphonate → Dimethyl 3-(3-chlorophenoxy)-2-oxopropylphosphonate

Participants

Reaction Steps

To 20.6 g (166 mmol, 238 mol %) of dimethyl methylphosphonate in 110 mL of THF at −78° C. was added dropwise 65 mL (162 mmol, 232 mol %) of a 2.5M solution of n-BuLi in hexanes. After addition was complete, the mixture was stirred for an additional 1 h, after which 15.0 g (69.9 mmol) of aryloxyester 10 in 40 mL of THF was added dropwise. The reaction was stirred for 1 h and then quenched by the addition of 100 mL of saturated NH4Cl. The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated, and the aqueous layer was further extracted with ethyl acetate (2×100 mL). Combined organic layers were dried over MgSO4, filtered, and concentrated, to afford 20.5 g (100%) of 11 as a viscous oil. 1H NMR δ 7.22 (t, J=8.1 Hz, 1 H), 7.05-6.90 (m, 2 H), 6.85-6.78 (m, 1 H), 4.72 (s, 2 H), 3.84 (s, 3 H), 3.78 (s, 3 H), 3.27 (d, J=22.8 Hz, 2 H).

Provenance & Evidence