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0 °C

Et3N (943 μL, 6.76 mmol) and tert-butyl 4,4-bis(hydroxymethyl)piperidine-1-carboxylate (790 mg, 3.22 mmol) were combined in CH2Cl2 (25 mL) and cooled to 0° C. A solution of methylphosphonic dichloride (428 mg, 3.22 mmol) in CH2Cl2 (20 mL) was added dropwise over 1 h. The reaction was then allowed to warm to room temperature over 1 h. It was subsequently diluted with saturated NaHCO3 and extracted with CH2Cl2 (2×). The combined organic layers were washed with brine, dried (MgSO4), and evaporated to give the desired product as a colorless solid that was used without purification. MS: cal'd 306 (MH+), exp 306 (MH+).

1. temperatureto warm to room temperature over 1 h
2. extractionextracted with CH2Cl2 (2×)
3. washThe combined organic layers were washed with brine
4. dry with materialdried (MgSO4)
5. customevaporated