Triethylamine → tert-Butyl 3-methyl-2,4-dioxa-9-aza-3-phosphaspiro[5.5]undecane-9-carboxylate 3-oxide

Participants

Reaction Conditions

Reaction Steps

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+).

Provenance & Evidence